Straight from the horses mouth, click your itunes update buttons later on today and you should find the itunes 7.7 update.

EDIT: 11:22 EST and still no update. For those of you wondering, an Apple employee mentioned that 7.7 would be available for download “in a few hours” about 8 hours ago.

EDIT: 3.00 CT iTunes 7.7 is now available for download from Apple.com and in Software update.