I've seen questions about how to get pages or websites indexed faster. I've heard answers that say that you should be patient - Google will finally get around to it. You can help Google get "around to it". I know that all the experts in here know about this one - but I've seen so many beginners (or self-proclaimed gurus) ask this question. I will give you one of the answers that I have experienced. Signature links. A popular forum where it is well travelled will help you get your page or site indexed a lot quicker. You don't have to wait around for Google. Yes - the ppl that say that Google will get to your site and index it eventually - they are right. but why wait? In the past, I have had a lot of new web 2.0 props out there as well as pages from my own site (or client's sites) that needed indexed. This is when I point a sig link towards it. If I just waited for Google to come around and index my web 2.0 properties - that could take forever. I hope this helps answer some questions out there.
There are two ways in looking on this issue. Firstly high page rank and second one is niche based. If you want to increase your PR go for high PR posts and if you want to get serps go for niche based forums. As simple as this...!