Thanks to many readers for the tip: Online retailer NewEgg has published the long-awaited OEM prices for Windows 7. Here's how they break down:

Windows 7 Ultimate Full $190 (compared to $320 for retail)
Windows 7 Professional Full $140 (compared to $300 for retail)
Windows 7 Home Premium Full $110 (compared to $220 for retail)

There's also a three-pack of Windows 7 Ultimate OEM for $550 and Windows 7 Home Premium OEM for $310.

So that's one mystery solves. Now how about those Windows 7 upgrades?  ;)