I wrote a post about how you can get free traffic and hits for your blog which you can
read here.
Basically it explains that by chosing the keywords you target in your posts you can use a forum attached to a strong site like this to actually start competing for keywords. Your site alone doesn't have enough relevance for search engine competition on most terms; this site does however.
Read the post at the link above and use it when you start a new thread. Even if you are just replying to a thread you can still input a title. I highly recommend everyone reads the post I linked to above... It will have a very positive impact on your blog's traffic; trust me!
I must add though that it is important to have a title / keyword related to the topic of the thread. Either way it's a way to bring people through to relevant content with your site / signature link in plain view.
Rob