I'm new to MyBlogLog. My community is at http://http://www.mybloglog.com/buzz/community/thedvdbuff/ How does one go about getting people to join the community and promote your blog on MyBlogLog?
You need to visit other people's sites, comment on their communities, invite friends, etc. It is fairly simple to do. I've written a post that details the answers to your question and you can read it here: How to Use MyBlogLog to Succesfully Build Massive Blog or Website Traffic
Nice post. On the "comment on their communities" part, better don't try to comment more than 20 or even try to spam others, be natural, go to communities's sites that you are really interested in. If your community is similar or relevant to the people's website that you went, it would be nice and your community will grow strong. Joining a related communities of yours, would be an advantage. Once your community are hot, i'm sure that many will follow or join yours. I'd been in the hot page before, and its surprise me, when people joining and visiting your website. Do the same to the one that visit your website, pay them back your visit, by visiting their website, or comment on their website if its interest you, or it would help both side, if you mention abit about their website on yours. Best of luck on your goal to success.
You're spot on about focusing on related sites and paying your visitors back by visits to their sites. Absolutely the way to go!