If you're smart, they work. I have hooked up with 7 women that I met through AFF or alt.com. Even had one semi-long term relationship.
But you have to ignore all the 20-something hotties who post nude pic of themselves. Please. Chicks like that have guys lining up to fuck them--they don't need to advertise on the internet. I have found most of them to be fronts for AVS sites--you give them an email and you get AVS spam forever.
What there are, is lots of married chicks in their 30s or 40s. They have to be discrete, so they often won't post pics.
I have written about this at lenght here:
http://www.askbucknaked.com/topicpag...inedating.html
Interested to hear what anyone thinks.