the only problem with running a vmware version (also google virtualbox) of ubuntu, I haven't been able to get beryl to work which is a great little "skinning" program for the os. It can make your ubuntu or kubuntu look like xp, vista, mac or many other ideas.. but if you don't care what your os looks like and are just using it for the applications then it don't matter and virtual os is just as good.
labrax, i havent install fc6 because my processor isn't supported... go figure. did you notice any benefits from core 5.... i heard they got rid of the core for 7 and now just call it "7"