1) thats really bad, there should be some check in the firmware for 100% load and kill the instance if there is no 'improvement/progress'.
almost like firefox (asks) for a website that is not progressing, that seems to work quite the same way.
2) I do not have a SD card installed.
3) I know its a small laptop, and therefor I like it very very much! :-)
though I was not really really using the device as I explained, however the internet connection was enabled. Its insanity to disable it en enable it every time you decide to use it... If not used it should not be sending a lot of data and stuff to keep it 'alive' and therefor it should not drain that much in my opinion.

I've had 3 HTC's before and as much as you could say for instability of these devices, the battery was great.
I could play around with them all day, run apps and stuff.
The battery for a HTC usually is like 10% of the device measures, in stead of the 2% or something from the N900.
However I'll NEVER turn back to HTC as crappy as the devices are! :s
hardware breakdowns/broken styluses without any good reason etc etc.
my N900 is COOOOL (or rather HOT, when taking such battery power...)

with all due respect: I CANT WAIT FOR 2012!!!! :P
Hopefully by then I'll have a Nokia N9000 running Maemo 7 or something
Besides of that it may be the end of the world (or a new beginning ) according to the mayans, maybe the beginning of real battery life improvement haha