Forum posting is still a rather effective way to drive traffic. Sure, most forums don't have a high page rank, but a backlink is a backlink and crawlers will consider it important when indexing it.
Ya,Of Course..Even though the forum sites has high PR or Low PR backlinks from forum sites will definitely be crawled by Google and forum sites with dofollow will help in obtaining quality backlink..
Yes, there is no doubt of forum posting, it is still effective of course but you have to contribute to the forums first.
Yes you are absolute right..Forum Posting are one of the best effective technique, by this we can increase our website backlinks along with good traffic..
I also use forums for promoting my services, and it is really helpful, there is no doubt to it really.