Me too; nothing wrong with it and some people will be positively impressed with how friendly you are even to people you barely know! Also, being straightforward and not embarrassed to ask someone's name again helps. A simple "I'm sorry, but I've completely forgotten your name; could you remind me?" is usually not too awkward unless you've met often enough that you should be expected to remember.

(Also, I am in DC, which is a very business card-exchanging area; remembering getting the card and seeing the name after being introduced is very helpful.)