I have now been using a T-Mobile G1 for about 3 months and still find it to be a rock solid device that is a blast to use. A coworker visited my desk today and said she picked up the G1 and loves it so far, but wondered how she could get her work email on the device. We just switched to Exchange about six months ago and also have IMAP support. She figured out all the needed IMAP settings, which was quite impressive because I couldn't get it right and it was very customized compared to a standard IMAP setup. Her question encouraged me to look again for any kind of Exchange client on the G1 and in the spirit of the football playoffs I scored a TouchDown!