If it's OEM...which in my opinion makes sense only if it can be purchased very cheaply as a Vista upgrade component as well. OEM would differentiate "Media Center 2008" from Windows Vista Prem/Ultimate which is a good thing as which end user wants to know their TV is running on Windows Vista given all the bad press and rep Vista has....but as long as those of us in the know can get the update cheaply and IT IS ACTUALLY WORTH IT!!! it should be a winner. working AUS EPG and 4 tuners native alone would be worth it here IMHO. Please don't delay any good features to Windows 7 M$....make Fiji a decent upgrade worth forking out $$ for and everyone wins.
This IMHO is a better strategy that releasing and Media Centre update in line with Windows, sure feel free to patch/Service Pack Media Centre at that time to allow better utilisation of that particular version of Windows if the previous version doesn't allow the same functionality....but for the love of all things common sense make the paid...full version of Media Centre a worthwile additional product seperate from Windows. Even better write the code for it so it can run on a Mac and Linux as well. Don't devalue it as a product...and value to it.
Keep the leaks coming and give us some more WOW even if it is delayed....if your short on ideas check out the requests section on this very forum....it's chock full of good ideas as well as the obvious no-brainers.
Oh and while I am back here on a good rant

ALL your extenders and Media Centre centric software should be starting to support Blu-Ray so get to it!!!!!!