Other than MGS4, I haven't really seen anything that seems like it's a jump ahead of the 360, tech-wise. 360 also has a few games coming out soon that will probably be well-reviewed and/or big sellers. I and several other Obsidian folks are considering buying a 360 for Dead Rising alone.
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*googles Dead Rising*
Actually, I don't think there is going to be a large amount of games using DirectX10, either, for a few years.