Quality links with sites that have a higher page rank is the best method to use, particularly, as smith_warnes noted, if the link is in-bound. But you have no control over that so it definitely isn't a fast way to get page rank.
Posting in forums and writing articles, blogs, etc may provide some benefit, just make sure links to your site aren't marked as rel="nofollow" (as they are on Daniweb) because then you won't gain anything.
Sorry, but I have to ask: do you work for bestittechies.com? Because it would be kind of ironic if you do...