I have used parallels on my macbook for awhile now, and have had great success with it. I recently installed parallels on my ubuntu 7.04 desktop, and after the manual prlnet.c tweaking (ridiculous that this is necessary to get it to run on a mainstream distro), got it up and running. The problem is that it runs XP like a dog. I'm running on a sempron 2800 w/ 1 gig of ram, and a 500G sata 7200 RPM HD w/ 16 M cache. Not a screamer of a machine, but should be able to run XP decently (which it does natively, btw, when I dual boot to XP). parallels-workstation almost never maxes out the CPU -- I have watched with top. No, what it does is sit there forever with the hard drive light on. It acts like it is taking FOREVER to access the hard drive. A lot of the time, the physical HD on my case is lit, but the HD indicator on parallels is not lit (this is with nothing else running on ubutu that would cause continuous hd access.) I have tried bumping the ram for the vm up to 600M, but still doesn't really help much. Also, I have installed parallels tools. Has anyone else had similar problems, or better yet, does anyone else have any possible solutions. XP does *work* under parallels workstation, but it is basically unusable for real work. If this is the best parallels workstation can do, then it's not a very good product imho, even though the mac version is great.