It's not much (what I did) but in 2.5 days I made 2 of the alien ships explode with smoke trails. The easiest one to point out is the crash right before the fade to the future of that Marine or whatever master chief kind of guy he is. Anyhoo, cool trailer/short thingy!
http://xbox360.ign.com/dor/objects/852871/bungie-project-2/videos/haloodst_liveaction_trl_090409.html