Microsoft has put together a pretty nice little giveaway: a free year of Xbox Live Gold when you subscribe to Office 365. The latter costs $99.99 (per year), so if you typically pony up for a Gold subscription anyway, it's kind of like getting Office 365 for $40.
You may be shocked to hear this, given my aversion to all things subscription, but Office 365 is actually not a terrible deal -- if you have a big family and a lot of PCs and mobile devices.
That's because your $100 affords you five desktop licenses (PC and Mac) and five mobile licenses (for iPhone -- there's no native iPad version yet, but one must assume it's coming, and you can run the iPhone version on your tablet if need be). That works out to $20 per person per year, which is not a bad deal for such a robust product.
Yep, I said it: Office 365 is a robust product. In addition to local versions of Word, Excel, PowerPoint, Publisher, Access, Outlook, and OneNote, you get Office on Demand: "streamed" (cloud-based) access to the first five of those apps. You also get 20GB of SkyDrive storage and 60 minutes of Skype calls per month.