They've got 9 up at the moment all from the recent GDC08 I believe. Fantastic presentations, which go into quite alot of detail into the game creation process of Halo3, my personal favourite presentation has to be on lighting and material, when you see the comparison shots with standard LDR lighting vs HDR it's such a huge difference! LDR looks just like Halo2
Go check them out!
http://www.bungie.net/Inside/publications.aspx
ps for those of you without powerpoint..
http://carnage.bungie.org/haloforum/hal ... ead=866401