I know quite a few people who've met, dated, married people they've met in AA/NA, (including my sponsor and his wife) and personally, I don't see anything wrong with that. The problem is when what PaperDolls described happens -- people preying on the vulnerable newcomers, or using meetings as a dating pool -- basically anything that puts their recovery or (especially) someone else's recovery at risk. The last thing someone new to recovery needs is to further complicate their lives by mixing romance and recovery. "No major changes for a year", they say. Plus, there's the discomfort of a break up or divorce with another member (kinda like dating a coworker), and the fact that it's usually recommended that you not attend meetings with your significant other for a variety of reasons.
I guess what I'm saying is that it's a not-so-great idea to look for love in AA/NA, especially in your early days and months, but if it finds you later on, go with it. Carefully.
--Fenris.