I noticed the "Google Experimental" link today at the bottom of the standard google search results page (http://www.google.com/experimental/), and "Keyboard Shortcuts" caught my interest.
This feature allows you to select the search result through the keyboard alone without the mouse.
Here are the keys (think vi).
J Selects the next result.
K Selects the previous result.
O Opens the selected result.
/ Puts the cursor in the search box.
In opera I was able to add this to my standard search bar by the following steps.
1. Open Preferences
2. Click "Search" tab
3. Select "google" and click Edit
4. Click Details
5. Add "&esrch=BetaShortcuts" to the Address string
6. OK, OK.
Now you can browse search results with your keyboard.
(I tried to edit the address string in firefox 2, but it doesn't seem to have the option. I tried: select "Search bar Management" from the search bar drop down, but it looks like you can only add/delete, not edit. May be firefox 3 gives you more freedom)
My computing started in the DOS and BBS days and I still long for a mouseless experience. (All bbs menus were keypress driven, read up on the pre-internet days http://en.wikipedia.org/wiki/Bulletin_board_system )
As some extras here are some standard windows short cut keys.
My favorites are "WINKEY+D=Show DeskTop", and "WINKEY+E=Open File Explorer Window".
WINKEY Pressing the Windows key alone will open Start.
WINKEY + F1 Opens the Microsoft Windows help and support center.
WINKEY + F3 Opens the Advanced find window in Microsoft Outlook.
WINKEY + D Brings the desktop to the top of all other windows.
WINKEY + M Minimizes all windows.
WINKEY + SHIFT + M Undo the minimize done by WINKEY + M and WINKEY + D.
WINKEY + E Open Microsoft Explorer.
WINKEY + Tab Cycle through open programs through the taskbar.
WINKEY + F Display the Windows Search / Find feature.
WINKEY + CTRL + F Display the search for computers window.
WINKEY + F1 Display the Microsoft Windows help.
WINKEY + R Open the run window.
WINKEY + Pause / Break key Open the system properties window.
WINKEY + U Open Utility Manager.
WINKEY + L Lock the computer (Windows XP and above only).
BTW - For programs I frequently use I use "Launchy" (http://www.launchy.net/) to keep my fingers on the keyboard.