http://uk.answers.yahoo.com/ Yahoo answers is great for traffic, it's basically a forum, but has so much traffic and authority with SE's.
I spent hours and hours on Yahoo (not that great of results). I think the people getting the best results also have other accounts "asking" the question, then answering it and choosing themselves as the best answer. Like anything with targeted traffic, it's worth it but the key is how profitable can it be. If you can't justify outsourcing it you probably don't want to waste your own time doing it.
yahoo answer is very typical for getting a big traffic it has so much ristration for share your link i suggest you use off page optimization for search engine traffic
I have pretty decent results with yahoo answers. Its a nice passive stream of visitors undependant of google
I've used Y/A. It's helped. Do they allow you to promote your website when you ask a related question? How does it work?