I'll let you guys in on a little secret -- Phil's not only the Editor of the best damn Android site on the Internet, but he's also a closet Android-geek. By now you know he's had the Asus Transformer Prime for a few days, and one of the things he had to do was root that monster hardware. Turns out it was pretty easy, which is good news for everyone. Using the Razorclaw app from the folks at Androidroot.mobi, it's a one-click solution -- install the apk file, run it, and enjoy the root.
Hit the Prime forums for links and details, and be sure to play safe -- at least until someone builds a custom recovery and we have software to roll back to. This one's gonna be fun!