FYI -- Not sure if this has been posted before, but DoomLord's unrooting script [HOW-TO] Root Phones w/ Android v2.2.x-2.3.x (zergRush Method) - Page 15 - xda-developers appears to work just fine on the Warp. (It deletes busybox and all the xbin symlinks to it, su, and the superuser.apk, and then cleans up after itself nicely. I walked through it first after commenting out all the rm statements to satisfy myself that it wouldn't do anything crazy, then restored the rms and ran the script. Within a couple minutes I was the proud owner of a newly-unrooted phone...

Note-- while running the unrooter, make sure you follow the on-screen instructions and keep your phone's screen ON. Superuser will prompt you several times if you want to give the adb shell root access. You need to say yes in order for the script to succeed.

Unfortunately, I went to this effort in the hope that once I'd unrooted I would be able to use the phone's system updater to go from B07 to B08. No dice, even after unrooting and rebooting -- maybe the updater script is looking for B06 and decides you're up to date if it finds a higher version? Looks like I'll have to use the online updating tool or wait for BoostMobile to rev up to another update build.

The failure to update was disappointing, but re-rooting with WarpDrive was painfree and only took a minute, and I'm back where I started at least.