.NET/Mono Install Base

Question

Me and some friends are considering writing a new FOSS project, and the debate is divided between using .NET or something else.

So I am wondering if there is an advertis

Answer 1

Hanselman gives a stat for .Net Framework Installs. He places it over 90% of PCs. with over 65% of PCs having 3.5 SP1. (This was posted on Jan 19, 2010)

I'm not sure where the numbers come from, but it's the only figure I've seen in quite some time. As for Mono...I'm not sure.