OK, this is not a scientific poll or anything, but I counted three Treo 600/650 devices in our small Local/Mobile breakout group. There were only 5 people in the group and no one had a Windows Mobile device. I had my PDA2K, but I was not using it much.
I did count 3 more Windows Mobile Phone Edition devices in the crowd though so that is not bad. I like my PDA2K, but the Treo form factor and Chatter email make it more convenient much of the time.