Evellen,
At this point .Net 3.5 is still in beta 2, so I doubt you'll see support immediately. Still, try Import Binary Module against the .Net 3.5 assemblies. My guess is that this will work fine.
As to the debugger, my guess is that we should wait until the final release of Orcas and such.
In the meantime, have you tried to debug code written against .Net 3.0? Perhaps try something with WinFx (the old name) code.
Please let us know if that works.
David