Ok! This is an old method but it's tried and true! Post in forums like you would normally with your links in your sig. Nothing new, right? Well, here's the twist. Get the URL to the thread (not to your post in the thread) and go to Google and add the URL. Then, when google spiders the post, you'll get a backlink reference. Kinda sneaky way of doing it but I do it on just about every post I do on every forum including GFY.