Here's a neat little website I learned about from Kim Kommando (her Cool Site of the Day mailing list is one of the best around -- I usually add at least one site a week to my bookmarks).
It's the Spam Proof E-mail Generator. If you put your e-mail on the web, spambots will find it, harvest it, and flood you with spam. This neat little website lets you create a graphic of your e-mail address. Spambots won't be able to read it and probably won't even recognize it. But humans can, and you can put the address on the web.
This is what the address would look like:
Easy enough for others to read, but, for spammers, it's only a picture.