What's your screen brightness set to? I (rarely) use mine above 3 and often use 2 as it is bright enough to use comfortably. A bright screen will use use a lot of power.

I am doing some experiments with battery monitoring at present. I have some theories but want to gather data first. My N900 is currently on day 3 without a charge, over 50 hours now. At 90% at the end of the first day, down to 20% now. This is with making calls, sending receiving texts, wifi browsing, some 3G browsing, downloading apps, playing games. I don't have wifi discovery or autoconnect switched on, and the wifi power is set to 10mAh.

This is with PR1.2, default theme, not overclocked, and about a dozen or so applications loaded from the main repositories - not using -extras or -devel at all yet.

All good so far.