Just so we're all on the same page here, Fog Creek is not currently using Mono in any part of Kiln or FogBugz On Demand. We use Mono to allow FogBugz to run on Unix systems for on-site installation, and we're looking at using Mono in Kiln for similar reasons. At the moment, though, Kiln and FogBugz On Demand are 100% WISC deployments.