I think the clr runtime for the xbox360 will be part of the sdk you can download at the end of this month.

Also i think the delphi.net compiler make compatible enough clr code as i can use it on my website i just need to provide some .dll files.

Speed may be a concern. But by using hardware acceleration features where available this should not be a great concern. (Less code is better)

The only thing i am a bit afraid of is that if microsoft feels like it they go for .net 2.0 instead of 1.1 and that leaves us with delphi.net in the cold as delphi.net cannot compile for .net .2.0