Our Marketplace pages in the mag cover the very best of DLC available anyway, and you may or may not have noticed by now that the 360 blog -
http://www.360magazine.co.uk - is now ENTIRELY geared towards Xbox Live coverage - a combination of spot reviews, weekly roundups and a list of the best things to buy each week should fill you in about anything and everything that's out there and any good.
For wider listings from the dim and distant past, why not just select the game in question on XBLA and check what DLC you can get for it? S' easy. I can't even begin to imagine how ugly a dense, spreadsheet-style list on page listing all the DLC ever would actually look. Horrendous is probably the answer.
So hit the blog, guys. And try to beat us at Asteroids Deluxe IF YOU DARE
