The second public preview of mono 2.10 is out. Get it here: http://mono.ximian.com/monobuild/preview/download-preview/ Draft release notes are here: http://www.go-mono.com/archive/2.10 The Mac installers (as well as the linux repos) now also include F# and IronRuby. IronPython is on the way but there are a couple build issues remaining.