Is really blog commenting and forum posting really helps increase your site traffic? how? i need to know more facts about that.. ^_^
For the most part, commenting on blogs and posting in forums will NOT send you huge amounts of traffic. Won't even send you a "good" amount. Nor will it greatly impact your organic rankings (SEO).
The best long term strategy for blog commenting and forum posting, is to establish yourself in the industry or market. Let people know.. "hey! i'm here, willing to play, and most importantly have something worthwhile to contribute." And really.. that's all you should do it for.. to contribute. No blogger or forum owner wants people commenting/posting solely for personal gain or benefit. Think about it.. would you want people contributing fluff info - just so they can obtain a few links or some traffic?? What value does that bring to your website?
Just say No to comment and sig spamming. It gets us all nowhere and quite frankly, the search engines (aka Google/Bing) already know to ignore sig and comment links. Big waste of time IMO.