Adding the finishing touches to a user form cab be fun, here are some cool Icons to help you out!
particularly noteworthy

http://www.yellowpipe.com/yis/download/free-icons.php?seenIEPage=1

and a really full list here:

http://www.maxpower.ca/free-icons/2006/03/05/

UPDATE, UPDATE, UPDATE:

there are some amazing works of icon art here too:

http://interfacelift.com/icons-win/index.php?sort=date