Afraid your significant other placed a keystroke logger?
Want to keep your net surfing URLs private?
While no solution provides 100% security, but bypassing the traditional keyboard will help...
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My-T-Soft Virtual Onscreen Keyboards
I-Tech Virtual Laser Keyboard (bluetooth)
Click-N-Type Virtual Keyboard
MountFocus Virtual Keyboard
FREE Virtual Keyboard by MiloSoft
For the more technically advanced...
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Virtual Keyboard Interface - Adds a virtual keyboard to text fields, password fields and text areas allowing keyboard-less input of text and special characters. Install the script and double-click on one of the form element types above to display the keyboard. This is a Greasemonkey script and will work wherever Greasemonkey works. (download page)