> it is just to obvious that the issue is in the SW.

Actually, I just upgraded to Diablo on my N800 and although I do not have much experience with OS2007 battery life, I believe I am getting very good battery life. Typically 10days, 6 hours (reported) on a full charge with WiFi turned off. In practice, I get about 3 days of use without power-down and maybe 90 minutes use per day with WiFi and max power saving. Seems about normal compared to posts I have seen here. Note that I had a pretty clean system before I did the upgrade. Basically no apps installed but the ones it came with (I just got it 'new').

It *does* look like the poor battery life is related to the upgrade on your system, but probably not OS2008 itself. Hence that list may be useful after all.