Installed Windows 7 into VirtualBox and it went well - running fine. Not too sure I'm crazy about the GUI either. Had to hand-job two drivers (network driver and sound driver) from the Guest Additions but ran into that new "scary feature" of Windows 7 ... here's an excerpt from internet:
Now that the network driver is installed, we only need to wait a few seconds to install the sound driver. One of the cool (Or scary, depending on how you look at it) things about Windows 7 is that if some piece of hardware needs a driver, Windows 7 will just go out and look for it. In this case, it goes out to the internet, finds a driver for the Intel 82801AA AC’97 Audio Controller and installs it without any interaction from you. Kinda cool, huh?
So sure enough, installed the network driver and once up and running, it found and downloaded the sound driver under-the-covers.
-Shawn