Well, i have atleast running: Facebook, twitter, rss aggregation, gmail and k-9mail imap idle, gtalk plus weather and my phone is at around 30% end of a normal day with a few calls and around 2hrs rss reading on my way to/from work. Only one day battery life is quite sad compared to featurephones but i'd say it's normal for the smartphone of today. Oh, and i have gps/wifi turned on that day. Android 2.1 admittedly has some big improvements around that, as on my G1 wifi/gps made a much bigger difference. According to the battery stats the display is draining by far the most power anyway.