Interested in printing a web page, but only want a certain section? Both Mozilla and Internet Explorer make this easy. Simply highlight the desired section, click on File, Print. In this dialog box there are choices for Print Range. Choose Selection:
Click OK, and you'll get a print out of your selection.
Firefox 2's suggest-as-you type Google search box is an instant calculator.
Simply type your mathematical formula into the search box (Alt-K Ctrl-K to get there quick) and you'll get your answer even before you hit the equals sign.
Do you hate how, when you have a bunch of tabs open in Firefox, they scroll off the tab bar with right and left arrows?
To fix this, in the address bar type in 'about:config' without the quotes and hit enter. Scroll down until you see 'browser.tabs.tabMinWidth'. Double-click the number to the right of this, put in 0, and click OK.
When you restart your browser, it will no longer do that.
Firefox 2 has a great built-in session manager, which I've become a big fan of. You can easily bring closed tabs back from the dead with this keyboard shortcut: Ctrl-Shift-T
Since Ctrl-T creates a new tab, this makes this keyboard shortcut easy to remember. It works great, espcially when I close the tab next to the one I intended to close.