Yes, during the first pass install, it will NOT accept your upgrade serial... Microsoft wants you to buy the full version if you don't have a legit activated os installed, even if you have valid licenses not in use like me. Instead of toying with it on that step, just run right by it and use the trial version w/o a serial number, and then do an in place upgrade for the exact same OS.
As for myself, I think my adventure of setting things up is coming to an end.
For what its worth, if I didn't mention before (2 hours sleep in last 48++ hours and counting, staying awake from large dosage of caffeine pills, energy drink, coke cola, and coffee), my system is early 2009 alumin unibody macbook, non pro, 4gb ram, 2ghz dual core. So the bootcamp drivers will complain about my model doesn't support 64bits. Here's what I did, and what my current status is...
1) Insert Leopard DVD that came with unit
2) Start > cmd, right click on the program, choose run as administrator
3) D:
4) cd "Boot Camp\Drivers\Apple"
5) msiexec /i BootCamp64.msi
This installs the 2.1 build that came with the machine, which offers the proper keyboard drivers and trackpad drivers. Then, download BCUpdateVista64.exe from Apple, this will offer a newer version of 2.1 build, which have the proper graphics drivers. Install that. But, it will break your keyboard and dvd drive (can't eject) for some reason, so, counter productive as it may seem, repeat the leopard steps again to repair the boot camp drivers.
I have everything working the way I want, with only one small problem of having 2 bootcamp icons tucked away in the small triangle, hiding the non-primary task tray icons.... Frankly, I don't care about the extra one...
Finally, go back to D:\Boot Camp\Drivers\Nvidia and run NVidiaChipset64.exe, this will fix the last "coprocessor" hardware in device manager that doesn't have appropriate driver, and bring your entire hardware profile to a-okay status.
Hope the info I've posted helps some people getting their Win 7 boot camp running!
PS: To be honest, I don't know if it is a good idea to run Win 7 in VMWare Fusion 3 when it comes out... VMWare Fusion 3 offers a virtual set of hardwares instead of your real hardware, as such, Microsoft
might, under certain conditions, detect the "hardware change" and technically could nullify your license for piracy... Though, I don't know if they'd do that or not... But, if people start to do that, and don't have a problem, then I might make the jump too... VMWare team did mention that you can play TF2 and L4D through it w/o too much performance hit, so it's a nice to have kind of thing
PPS: I'll probably write a blog entry with the whole thing step-by-step tomorrow after I get some sleep and have some spare time to seriously test the system for stability issues.