Another Technet update...
First, still LOVING IT!
Second, there is a 64-bit version of 7 Home Basic. You just can't download it on its own. When you download an iso for 7, unlike Vista, you appear to get the one edition you requested, unless you expand the iso and remove a file (ei.cfg). If you take out that file, you get the list of editions to choose from, like you did with Vista. If you do that with a 64-bit iso, you can select the Home Basic version.
Third, when I listed the XP Home editions, (XP Home, XP Home K, XP Home KN) I forgot XP Home N. So for XP Home, you get 40 keys that require an additional download or two to all be the same. XP Home, XP Home K and XP Home KN all use the same iso. XP Home N is a different iso.
Fourth, STILL LOVING IT! 
EDIT... and add Vista Home Basic N and XP Home KN to the list of keys that I've used.
It's much easier (and usually faster) to install 7 from a USB flash drive. All that's required is to format the drive in Vista or 7, create a partition, set that partition active (Vista/7 diskpart can be used for this) then copy all files to the root of the flash device. This makes removing/restoring/editing the sources\ei.cfg file much more convenient.
Okay but really, who would want to install a 64-bit version of Home Basic? I only ever install 64 bit Premium, Pro, or Ultimate unless the machine in question simply doesn't support 64-bit, but I can't see anyone willingly using the hideous basic theme full-time. Puke.
Also for anyone wondering what the use of Ultimate edition is (aside from what's openly advertised) - Ultimate remote dekstop supports Aero Glass. No other edition does. Silly reason to PAY for Ultimate, but if you've got nearly unlimited access to any version you want, it's a decent reason to choose Ultimate.
There are a few other random things about Ultimate that make it marginally worthwhile, but they escape me at the moment.
XP Home K - special Korean antitrust version of XP Home
XP Home KN - I assume is some kind of amalgamation of the European antitrust version (N) and the Korean antitrust version (K) of XP Home, though I'm not sure what exactly the market would be for this version.
K - no Media Player
N - no IE
KN - no WMP, AND no IE.
