I just ran into a similar problem, ran top, then corky and both were showing me that the cal app was eating 76.5 percent of my cpu, and the cpu was running at 100%. Drove me crazy then I remebered I had changed a setting in the cal function, to keep dates for 1 year past. I changed to 1 month and rebooted the N900, and now in standby I am 2-3% instead of 100% and back to 2 days of normal usage per charge, which is a mix of wifi, 3G, txt, voice, pics, games, and a little bit of everything.. hey its still new!! This problem didnt raise it's ugly head till I upgraded to 1.1.. Hope this helps. Craig