You know, realistically, is there really anything PRO about any laptop? If you want to do power computing, don't most people go to their desktop? Just asking.
Nah, I use a laptop only for work, because being in IT I move around a lot, work from home, etc.
Currently I've got a Thinkpad T61 w/ the 2.4 C2D with 4GB RAM, running XP Pro. It does great with VMWare Workstation, audio apps, video, etc.
Sure workstations are faster, but the mobility is definitely an advantage for me. I suspect that's the case for a lot of people using it "professionally".