As @duDE's answer pointed out, for working in Visual Studio on the PC in the pre-Xamarin2.0 world, there were quite detailed instructions available on http://slodge.blogspot.de/2012/12/cross-platform-winrt-monodroid.html
As various releases of Xamarin 2.0 have been released over the last month, these type of instructions have become more and more difficult to keep up to date... and this situation is likely to continue for a little while yet as Xamarin are currently adding:
- .Net 4.5 (Mono 3) support
- async/await support
- PCL support
This work is being done with some urgency, but without any official target date - so I'm afraid there isn't any easy way to predict dates for Alpha, Beta or final availability.
For the current OSX setup, I think you can use:
- the current XamarinStudio/MonoDevelop - 4.0.2
- the current stable Xamarin.iOS/MonoTouch and Xamarin.Android/MonoDroid - do not use the Aplha channel
For the current PC setup, I think you can cannot use Xamarin.iOS, but you can use:
- VS2010 or VS2012
- the current stable Xamarin.Android/MonoDroid - do not use the Aplha channel
- with just a couple of changes:
For discussions on getting things building and running, don't use StackOverflow - instead use one of:
as a backup you can also try https://jabbr.net/#/rooms/mvvmcross
Don't even think about trying to get an MvvmCross app built - on the free version of Xamarin - it's limits are way too low for any app I've tried to build.
If you are looking for some starting app templates, use: https://github.com/slodge/MvvmCross-Templates
If you are looking for some pre-built binaries, use one one of the folders on: https://github.com/slodge/MvvmCross-Binaries - please note that portable libraries built on the Mac are not portable across to the PC (or vice versa) - they will be 'soon' but not yet.
Sorry for the fact that we don't have a neater, finished solution... we've now been fighting to hack PCLs into Xamarin for a year. However, the good news is that really soon that battle will be over and we can all get on with the apps :)
I guarantee this answer is out of date inside a week...