For one thing, there are lots of C# programs that can run on Mono outside of Windows, even if some parts of .NET are not yet implemented.

I have never programmed with .NET (been coding exclusively in linux for years), but the framework looks interesting and the WPF has caught my eye. I will probably be one of those who will be exclusively learning the mono version of the .NET story and C#/F#. Though I guess there are very few people in my boat.

i also use mono on ubuntu. if the scope is larger than what i want to do in a scripting language, like bash, then i use c#. it's a great language. i have my eye on mvc support in mono, because if all goes well, i can save a lot of money on windows 2008 licenses.

We're running C# code, and increasingly some F#, but not at all interested in taking desktop or web applications from Windows and dropping them onto Macs or Linux.

We're historically a microsoft shop but recently (in the last 18 months or so) have started running linux backend servers for many of our services running on EC2. If I wanted to be buzzword compliant I'm sure I could come up with some string of cloud nonsense to describe it.

We have something that looks kinda like Hadoop crossed with an app server that we can deploy components in.

I'd be happier with a solid final version of Mono.Simd rather than slavishly filling in any missing parts of older .net.