So will those codes still work even though it's not on Games on Demand?
I was able to redeem a code for Joust after it was delisted. Did some Googling to make sure of the dates (oddly, Joust isn't listed on XBLDB, must have been before the site went live), and it looks like you did, too.http://www.cheapassg...ad.php?t=310545
Granted, XBLA may be handled differently than GoD for reasons only Microsoft could (poorly) rationalize. A couple eBay sellers have received positive feedback on Alan Wake code sales in the past couple weeks, so unless there's shenanigans, they should still be good.
The Best Buy close to my work still has a few of those XBL 12 month cards with Joust codes on them. Asked for them to be price checked, and they're still $50 instead of $60.