there is a "one click" root method over at android central. it basically walks you through the root process, and as long as you can read some simple directions and press a few buttons, you will be rooting within an hour. works as long as you are on 2.2.1
i would post the link, but not sure if that is allowed on these boards. just go to the thunderbolt forum at AC and it is in the developement forum.
i am currently running Das Bamf RC4.9 which is sense 3.0 and it is a really solid ROM.