Check out OpensourceCMS, a website that lets you log into about a dozen different CMSs *as admin* to play around. Every configuration is reset to the default once/hour so your changes are not permanent.

MT is wonderful, but some people here may want to do things that it isn't equipped for. This is a good way to see what's out there.

Wow, nifty link!  I logged into a few, cool idea.  :)

Wow. That is cool.  :)

As long as we're on the subject, Textpattern looks like a very promising blog/CMS tool. I don't think I'm going to stray from the MT fold, but this is worth keeping an eye on.