As I've mentioned, XBLIG are all being delisted next month, mine included.
Interested in one of my games, but not sure if you want to buy it? You can have it. Just ask.
You see, when each Xbox Live Indie Game was published, the creator received 50 free download codes. These were intended to be used for reviewers, for giveaways, or for whatever. But I'm guessing that these codes will no longer work after the delisting. Granted, this has not been confirmed or denied by anyone at Microsoft, but I have my doubts. And what good would it do to hold on to download codes that no longer work?