Mono at the PDC
Miguel posted his summary of Mono at the PDC. It's a good read if you're at all interested in .NET portability.
In it he says something he hears a lot of is "We are using C#, we need to be portable but we are not going to rewrite the software".
Of course Mono is never going to be "as portable" as Java, but if a large enough set of core services can be implemented on Mono, more people would be willing to use Mono as their cross platform story (and I think developers would be willing to stick to the core set of functionality that works everywhere).