I want to know the list of sites which are related to questions and answers I will start the thread with a few and you all plz keep adding to the list askopedia.com answers.yahoo.com answers.google.com linkedin.com/answers http://wiki.answers.com/ plz add any more resources where you can answer to questions and leave a link at their site I am eagerly waiting for your help
passing of link juice is not important what is important is just links and let me tell you that no-follow links are seen as non spammy and such links DO increase the relativeness of your site
Q&A sites are okay in the short term for quick traffic boosts and if you have hours to spend posting on them they are great, but long term Matt is right they won't help build high quality backlinks, although Q&A sites are useful, i use them myself. I must stress though that it is only one part of my link building strategy.
Answering to relevant questions in Yahoo Anwsers also gives some targeted traffic (tested it in the past). Not all comes to passing link juice...
what i think is that these types of sites are good resources to build links for new sites and plz add any other q&A sites that you know
passing of link juice is the ONLY thing that's important these days. i've discovered (at least for my business) that you can advertise all over, but the only thing that matters is ranking highly for chosen keywords. that way, you are present when somebody is LOOKING for you and wanting to buy.