Well, I gave it a shot. I did not have the OEM version installed, so the CERT gave me an error. That's easy to fix as there are tons of utilities out there that will inject the correct cert for it. "Windows 7 loader" will do it under the Advanced Options.
People think that the only reason you would do something like this is piracy. Maybe that's true for alot of people, but I can tell you I ran a hacked version of Vista and I have several copies shrink wrapped at my house.
Why? Because MS is a pain in the ass. I understand they need to protect the product, but every time they protect their stuff, it becomes a pain for me.
I install, reinstall, screw around with my system all the time. I have installed Vista/Office/etc I got sick of calling MS to say "Yes, its only installed on one system" if I used the wrong copy with that particular system. I am sick of having to make sure all my copies are matched to the systems I have.
So now I have a box with all my legal copies of Vista, Office, and now Win7 sitting in a closet and can install all I want without needed to open each one up and so on. SO much easier for me.
There are lots of reasons to want to bypass their piracy crap, but please people, buy the damn thing. Windows 7 is awesome and worth the money.