Borland have released a 'Delphi for .NET' preview recently at the same time as Delphi 7. It is not a fully functional, full spec implementation but a preview of what they plan.
There's a lot of documentation and references to this on the borland website, if you take a look.
I saw it demonstrated at Borcon2002 and it worked back then, but they have some implementation methodology issues to solve before a final release of the product.