Carthik Sharma has written an excellent guide for moving from Movable Type to WordPress. It walks you through step by step of downloading, installing, and understanding WordPress. I also like that it has pointers to a lot of documentation resources outside of wordpress.org.
I also wanted to take this oppurtunity to say “howdy” to all the new visitors we’ve been getting the past couple of days. We’ve got a great community here and WordPress gets better every day. (That’s why we have nightly builds!) Please feel free to poke around and explore. If you try WordPress and decide not to use it, please leave a note on the forums or send me an email (m at this domain) with a little feedback as to why you made your decision. It’ll help us make WordPress even better in the future.