Just wanted to throw this out there.

My N800 started draing quickly. I rebooted several times, enabled/disabled status barr / desktop applets to no avail. I run off of a cloned partition on my internal card. I finally booted to flash and fsck my cloned partition. Several errors were found and fixed. Rebooted and the mysterious drain had stopped. Started again several weeks later, fsck'd the cloned partition rebooted and all has been well ever since.

Don't know why this would work but it seems to have in my case.