Mono 2.4 and MonoDevelop 2.0 released
tirania.org
tirania.org
This is a big release for mono, I'm huge fan of the project. C# is actually being designed unlike java, and with each new revision is getting much better.
Here's a cool demo of a mono REPL:http://lucasmeijer.com/files/messagewindow.swf
Can't wait to see some mono based asp.net mvc apps built with this new version
The issues I ran into were many (eg windows forms, data access being not or only partly implemented) so I just gave up and ran the original .NET in a windows virtual machine, rather than mangle it to work with gtk#.
So in principle it is an ideal idea that in practice has many issues due to MS driving .NET development and MONO having to play catch-up and then attempt to mangle the windows-specific code to be cross-platform. YMMV.
It supports both windows and os x.
My game is very simple, graphically, and doesn't need 3D (it's a pattern and sound-based brain game, so it isn't fast and it isn't flashy; it's being written first as a web application, and then it'll be ported and enhanced for desktop and iPhone/Android)...but I might try to figure out a way to make it use 3D just to have an excuse to buy and tinker with Unity.