ok looking a bit more into this for you, the domain was only registered in May 2006 so there is a high chance you are stuck in the google sandbox.
Having a PR6 means nothing when it comes to SERPS as they are totally seperate. The higher the PR does NOT equal higher results in google.
Using the following site : http://www.mcdar.net/ you can check a lot of different things out. If you look at "Keyword Analysis Tool" for your webby and the term 'nerd' you don't even have a allinanchor yet so in theory you site is not ment to be placed anywhere within the results for the term nerd.
If I was you I would keep trying to build quality links from relevant site, don't get to many links a month, maybe 50 or under and carry on getting people to post on the forums.
Subbmitting a site map is useful if your whole site is not indexed in google really, some poeple like it some hate it, I have not had any problems with them but maybe I've been lucky.
As a side note: remember that google is rather fooked up at the moment with no one really knowing what the hell is going on, there data is all over the place.
Just get the backlinks, build the community up, produce quality content and in time (time is a big factor) you pages will rank better in google.
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