Simply clicking outside of a box every so often and typing gets recorded.
for example I'm goign to demo what I mean based on a typgin part of a password, and some junk outside the box and then the rest of the password:
Password field contains: mysecurepassword
Keylogger records: my really unsecure asdasdfspasjljsjkjweor jkld
Wow, this is really interesting stuff! I never knew about "keyloggers" until
glee4 brought it up. Good info to know.
You could do it better than Ed's method. Say your password is "password" (you evil fiend!):
p(le)as(e )s(top u)s(ing keyloggers )w(ith public c)o(mputers )or( )d(ie!)
mussavcom - you are such a joy to read!
I'll have to admit I used to use them in my "bad" days

Aha! We have found the culprit who is messing with our email! Hmmm,
Ed, we're going to have to keep a watchful eye on you, my dear.
P.S. Watch out for large spiders the next time you go rock climbing!