It will eventually go away as part of merging the two sites. There was kind of an ongoing issue with overlap between streets.mn posts and comment sections overlapping with largely the same people. We explored lots of technical stuff, but at the moment there's not really a great/easy way to combine WordPress and phpBB. If we get a pile of grant money next year (a hope) then that's something that will probably happen. In the meantime I changed the logo and will work on doing little things like that over the next couple weeks.
Why not pay the 12 bucks a year and keep the urbanmsp.com domain name and add a redirect?
And why not just take donations to raise the money that you need to do the work you need? Which way are you going? PHPBB to wordpress or vice versa? take the title of the blog entry and that's your subject and your starting thread for your reply posts. It's just data.