If you, for example, install multiple media player applications on your Android device, you’ll find that Android will give you the choice of which application to launch by default when you open a media file or document. However, you may later want to change this default setting.

To do so, go to Settings > Applications > Manage applications and then press the "All" tab. Choose the application that you previously selected as default, and scroll to the section "Launch by default" and press the "Clear defaults" button. Next time you open that particular type of file in the future, Android will prompt you again to choose a new default app.

Ever surfed for the number of a pizza place on your iPhone and just wanted to dial the phone number straight from the webpage? If you are using the default browser on your iPhone, which is Safari, that's no problem at all.

Safari automatically converts numbers that look like phone numbers into links. If you press those links, a popup window will appear giving you the option to call the number from there or cancel. No need to write down or even copy and paste the numbers.

If you are using Internet Explorer and Windows 7, you may have noticed that when you mouse over an IE browser window, a preview of the open tabs in the browser is shown. While this is useful to give you an idea of the sites you have open, it can get annoying if you have multiple tabs open at the same time. If you would prefer to disable this feature, you can.

Just go to Tools > Internet Options (in the upper right-hand corner of the browser) and then click on the "Settings" button in the window that pops up. In the list of Tabbed Browsing Settings, uncheck "Show previews for individual tabs in the taskbar." Click on OK and you should be good to go.

A very useful feature in Microsoft Office is called "AutoRecover", which automatically saves your document at specified time intervals so that in case of an application or system crash, Office can recover its latest version.

By default this is set to 10 minutes, but you can change this easily by clicking on the Office button within the application, and then clicking on the "Word Options" or "Excel Options" (or other application) button in the lower right hand side of the window. Go to the "Save" section and look for "Save AutoRecover information every…" and change the settings there. Be sure to click "OK" to save your preference. A word of caution: setting the interval at very short timespans such as every 1 minute can slow down your computer with frequent writes to the hard disk. Try a number between 5 minutes to 10 minutes first.

The clarity of text and images on your screen can depend largely on how you set your monitor's screen resolution. At high resolutions, such as 1280 by 1024 pixels, you can display more on the screen—but text and images will look smaller.

At lower resolutions, such as 800 by 600 pixels, objects will appear larger but may look jagged and less sharp. The optimal setting to choose really depends on your monitor and the larger the monitor the higher resolution it supports. Most newer computers have already been pre-configured for you, but you can try various options to see what works best for you. You can quickly change this setting by right-clicking any empty space on your desktop, then choosing "screen resolution" in the menu.

Do you sometimes forget the file attachments you meant to include in an email message? Thanks to a free plugin for Outlook, now you can be alerted when you do just that.

Head over to CodeTwo's website and download the free Outlook Attachment Reminder. Install and configure it to scan for text in your email's subject line and body text (such as "attachment" or "attached" or "see document"). When you press the send button, if the system finds that you included these phrases but did not attach a file, it will prompt you to do so before sending out the email.

In Windows 7, when you access the control panel window from the Start Menu, by default you open the window using the Category view, and what you see is a shortened list of possible actions you can do from the Control Panel screen.

You can change the view to Icons to get a longer list, but this can display a confusing mess of icons. A possibly better way is to use the default Category View, and then in the Search box in the upper right corner type "e", for example. The search filter will then show the list of actions you can do which contain the letter "e". You will be amazed at how much Windows actually hides by default. You can then use the list to further narrow down the action items you are looking for.

In Outlook, you can color code messages addressed only to you, to easily identify messages that may be more important or require action from you.

Go to the Tools menu and choose Organize. In the "Using Colors" section, select the "Turn on" button next to "Show messages sent only to me in Blue." You can also choose to define a different color if you want.

Do you frequently use Google's online services such as Gmail, Calendar, and Reader? Do wish there were a way you could view all of these services in one page? If you use Mozilla Firefox as your browser, you're in luck. Firefox has a free Addon called "Integrated Gmail" which allows you to view these services from one page.

Go to the Mozilla Firefox Addon page and click the "+Add to Firefox" button for Integrated Gmail. Be sure to click on the Install button that shows in the popup confirmation dialog box. After the addon installs, restart your browser and then log in to your Gmail account. Magically, new links to Reader, Calendar, and other Google services will appear in your page.

Do you ever wish you could save files you find online directly to a cloud storage service provider? With this handy new free tool called Cloud Save you can. Cloud Save is available for the Google Chrome browser at the Google Chrome webstore.

After you install the extension in Google Chrome, you will find a new menu item when you right-click or try to download files in your browser. The menu item allows you to send the file (without having to download to your harddisk) directly to popular web-based services including Dropbox, Google Docs, Facebook, Flickr, Picasa, and more. Simply right-click a file, then decide where you'd like to send it.

Related materials: Google Chrome webstore