I'm folding with an XP1700 full-time, but I also have a PIII-500 laptop. I'd love to fold on the laptop as well, but I can't connect to the F@H project through the firewall at work. I guess I can try to dial in from home to upload/download WUs(I heard roadrunner provides 10hrs of free dial up a month for cable modem users).
I've been using the laptop for ECCp, but only because they allow you to manually upload your Work units (distinguished points). I'd love to fold instead (do something usefull for humanity).