I run bootcamp and Windows 7 on 1 of my iMacs, and on the other one i run Parrallels desktop and Windows 7.
The cool thing with Parallels is that you don't have to restart your Mac and it runs as good as bootcamp and you have both Osx and Win7 at the same time. Even cooler is that i like Gimp for Mac so i edit my images for C2 projects in Osx and then just drag them over to my other screen (i have 1 extra monitor) and baamm =)
Here is how it looks (the macbook pro isn't connected in any way)
<img src="http://i41.tinypic.com/igj0x3.jpg" border="0" />