Xbox.com has posted the details of the E3 press conference where Microsoft revealed when you'll most likely to be able to get your hand on an XBox, and how much you can expect to pay. To wit: November 8, 2001 and $299.
Microsoft expects to have between 600,000 and 800,000 units available the first day. Xbox.com also has the full transcript of the release as well as a rebroadcast of it.