Bastion’s Open Source Branch for MonoGame
supergiantgames.com
supergiantgames.com
They actually made the source code available a month or so ago, this post is just the first time they've announced it on their blog. I hope people in the MonoGame community have been integrating these changes back into the trunk since then! The changes to make better use of VBOs and avoid needless texture data copying will help many games run faster.
In general I've been an advocate of the MonoGame project; it fits a need that a lot of indie developers have, and it's built up a ton of momentum over the past year. I hope this leads to a lot more open-source game development tools.
I imagine it's still in their interests to be merged with the main trunk. Maintaining one's own separate branch isn't fun.