I'm not a fan of Microsoft Windows, but sadly I play video games that are best suited to running under Windows, and my laptop's Blu-Ray drivers don't play well with Linux, so I'm stuck running Windows in two places. Vista has been a chore, and from what I hear from my Windows-savvy friends, Windows 7 really improves on Vista. Call it "the apology," if you will (side note: I'm still waiting for my apology for Highlander II, which I saw on opening night with stratospheric expectations...)
So, now Amazon is offering something pretty sweet. You can pre-order Windows 7 from them and have it delivered to you on release day. They did this with World of Warcraft: Wrath of the Lich King as well, and I did get that delivered on release day, so I'm signing up for the same deal with Windows 7. The really nice bonus is that, being a Prime member, I get this option for free. No delivery charges!