I don’t see XBLA updates all that often but I try to grab them when I see them. Wednesday Axel & Pixel (800 points) will be available along with Sam & Max Season 2 (1600 points).
I don’t really know much about Axel & Pixel, but Sam & Max is developed by Telltale Games which from what I understand has been doing a great job of reviving franchises and replicating their feel. So if you enjoyed past Sam & Max games before you may want to give Season 2 a shot. You should probably play Season 1 first though.
(Source: Major Nelson’s blog)