I'm not, but would like to get one that has a 12" screen at about a little over 3lbs. Currently I'm on my over 7lbs 15" Sony Vaio which can be burdensome to carry around at school. Don't really feel like forking out another $1K+ when I just got my Sony earlier this yr. Which kind are you considering?
I've considered it but ultimately I think battery life is still too restrictive to trade w/ a wireless tablet pc.
I'm using a TabletPC and tried TWS. The user interface must be redesigned for pen-based computing. Hand writing recognition is less desirable in day trading settings. I think that a mouse-centric GUI w/o using too much right-click would be a good start.