There are three main parts to providing native .NET Micro Framework support on Linux and Mac:
1. Supporting .NET Micro Framework in MonoDevelop
2. Porting the MetaDataProcessor (.NET MF post-processor) C++ code to Mac and Linux
3. Tweaking the MFDeployEngine and MFDeploy tool to work under Mono
We've completed most of the work with #3 (MFDeploy). I have attached screenshots of MFDeploy in action on Linux and Mac to this post.
Finally, the Mono team has been very gracious in making enhancements to Mono to make this first pillar possible. If you have a chance, please give them a big shout out.
UPDATE: We have released the first alpha release of MFDeploy for Mono (Mac and Linux).