Gmail everyday. Analytics Adwords account And if search counts, scratch adwords as i use search a couple of hundred times a day and only check adwords once. They be my top 3. No need to check adsense as they send me the cheque when it's due anyway. I also use just about every other google service there is. (Except maybe Orkut)
1. search daily 2. trends a few times monthly nothing else all other facts I get from my own resources