I'm in CA, and for a while I had EIT after my name on my business cards. However, I had it taken off at the next printing. Here's why: I work for a consulting engineering firm, and when clients see that my card says I'm "only" an EIT, they tend to discount my knowledge. I've been in this industry doing my job for 10 years, so it kinda sucks for that to happen to me, only because people think I'm fresh out of school with no experience when they see "EIT" after my name.
So, think carefully about putting it on your card. If you are young and fresh out of school, it's perfectly appropriate to have it on your card. After all, that was one heck of an exam and a huge accomplishment. But, if you're like me (forever in school part-time while working full-time and finally got my EIT), maybe not.