I recently joined Digital Point Forums, to find out what they had to offer in terms of advice, and opportunities. Though they are not specifically for bloggers, but for all manner of websites, this is a resource that is too good to miss.
You can find advice on SEO, Adsense, text links, websites, maintenance, etc. In fact, you can even buy and sell in their appropriate forums all manner of goodies, links, templates, content, and websites. There are also people selling services here.
As a resource, you have to check it out, if you want to grow your blog.