VMware is the best virtual machine for running Windows or linux, at least in my opinion and experience. I have used several of the others including Parallels and the recent freeware products and although Parallels was first to market and has similar features, it is still outdone by VMware fusion. This is huge considering Parallels is at version 3 and fusion is just now starting beta for 2.0. The stability factor versus Parallels was noticeable for me, with my system giving me an occasional kernel panic when Parallels was installed. The support for VMware is fantastic too and the fact that 2.0 will be a FREE upgrade is over the top and completely awesome!

As to the features of VMware, one of them that is awesome is the Unity mode which loses the windows desktop and puts a windows xp app along side the Mac apps. I realize that Parallels has something similar with Coherence mode but the VMWare implementation is far superior, as you do not have an ugly windows task bar by default. I think they improved that in version 3, but no need to use parallels for me as it just keeps getting better. There are plenty more great features too like full USB 2.0 support, the ability to assign multiple cpus, 3D graphics acceleration and more.

If you are looking for a way to run windows apps on an intel Mac, look no further you have found the best virtualization has to offer!