DX10 is going to be called WGF in longhorn though isn't it?
I'll reiterate the point I made some time ago about Avalon - if it's only available in Longhorn, nobody will program to it. I don't see many people upgrading to Longhorn, not in the first few years anyway. It'll be like when win98 came out and lots of people
stayed in win95 for years. XP was a watershed release that got a lot of people all on the same version and since it works pretty well Longhorn will have to be *really* frickin' good to get anyone to upgrade. Therefore any API that's only available on Longhorn
will basically go unused for a long time.