Hey.. Look what I found..
It has source too.
If you are going to install it on vs8 you'll need to have vs7 installed as it seems to have a dependency on it.
Also, I bet that workspace whiz could probably be made to work on vs8. It just might need a new installer or fuss with registry keys manually.
Have a look at VSTabs too. I just installed it and it looks pretty nice so far.