I had some trouble with Parallels, it did not start any Virtual OS. But it's solved now - if you have same trouble, remember to check Intel VT or Intel Virtualization Technics settings from BIOS

[<- when you are a n00b, you can only blame yourself]
This topic was "Post your virtualization screenshot" .... well, im sure someone has figured out this before, but :
Set up Spaces, and you can have Virtual OS on other Desktop as "Full" and you can switch between them with F8.
like in my photo...
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Just open Paralles, and first OS. Push F8 and drag it to space2. Then open second, drag it to 3 and third...... Start them and use Full Screen mode and you have 3 - 4 os running, and by pushing F8 you switch
and as it seems, 3 OS running leaves some RAM free.. this is, if you - by some odd reason - need Windoze for something
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Of course you can use Coherence, but i prefer this.
bw,
Kari