I use the non-preemptive (server) scheduler on my linux desktop machines with fvwm as favorite long-time WM. At work: RHEL with dwm, which I'm starting to love, also forced to use Windos 7. Boy, this MS sh*t drives me mad. The focus stealing alone is enough to go berserk. The slowness, the deadkeys, the placement of the windows, the lack of virtual desktops...