[RootbeaR]

"Your best defense is not to use any untrusted computer to sign in to any site that contains banking or sensitive personal information. When you simply must take a chance on using a random PC, however, you can minimize the risk — if not eliminate it.

Security blogger Ian Saxon publishes an approach that may not be 100% foolproof but should provide some reasonable protection when entering passwords. Writing on his Defending the Kingdom site, Saxon outlines what he calls the "revised Vesik method" for entering passwords:"
http://WindowsSecrets.com/comp/090910

[hewee]

I use KeyScrambler Personal
http://www.qfxsoftware.com/index.html

It helps out but the premium edition is so much better.
http://www.qfxsoftware.com/products.htm

KeyScrambler encrypts your keystrokes in the kernel, giving keyloggers only "scrambled," meaningless keys to record.