Hi, Leland.

>I suppose the mono classes are built independently of dotnet, so there could be some incompatibilities or incompletenesses between the mono framework and dotnet framework.

Well, of course, there are some, but basically Mono tries to support as much as they can the Framework as is.

>What if I write a dotnet app in VB.NET. I know C# standard has been released to the international community, but VB.NET may be proprietary intellectual property of Microsoft. Assuming that mono would handled VB.NET source code, would I be in violation of any licensing agreements if I placed VB.NET source into mono? I know there was a big discussion just recently over whether VFP could be use on the Linux platform without a license.

Mono doesn't support VB.NET. Yes, this is a propietary language, and it has been not submitted to any standards body as C# was. This is one of the issues you have to take in consideration when deciding between VB.NET and C#.

All the same basically applies to Rotor as well, which runs over Windows XP, the FreeBSD operating system, and Mac OS X 10.2. You can take a look at:
http://research.microsoft.com/programs/europe/rotor/

Enjoy,