Before you upgrade to Community Server, be aware that they’ve turned it into a commercial product. Yes, there is a non-commercial license available, but it requires you to display the following image at the bottom of every page.
I have no problem giving credit where credit’s due, but this is in stark contrast to the BSD license employed by .TEXT and you should be aware of this if you plan to upgrade to CS.
For example, competitors to Telligent would probably want to purchase the commerical license rather than have to prominently display their logo on your blog.
In any case, I’ll probably stick with .TEXT and start looking into what it will take to switch to DasBlog. I think I prefer the more focused approach DasBlog takes.