Hope the title didn't get you too excited... it's still being worked on, but no kernel is correctly reporting CPU temp at the moment (at least none that I've tested).
TempMonitor itself will blaze right up just fine when the kernel support is there and show cpu temp as always. Some of P3Droid's kernels now have partial support, but the temperature doesn't update correctly (yet). It is actual CPU temp, not battery, but it locks up and fails to update when temp changes.
I've seen/heard of TM causing a reboot if used with a 2.2 kernel compiled with old mods. This is not TM, but the mods themselves causing the reboot. If you are a user, and you run into this, please install another kernel. If you are a dev, and run into this... well... everyone else has too... remove the mods and re-compile.
If anyone has any pertinent info that I'm not privy to, please let me know.
Side Note: Widgets are still coming... I've been slacking... had to move... swamped etc. Their still in the game plan, before anyone asks.