Since 0.5.1 almost all know code-completion bugs have been fixed. If you have C# code that you think should be completing but isn't please file a bug with a small example. We also fixed many of our non-wishlist or feature request bugs. These will be in our 0.6 release.
I posted what I know to not work at the MonoDevelop list. A recap:
Things I know about:
If no serious bugs come up with completion, I plan to start looking into adding C# 2 support to the parser which could involve going a few different directions.
Since 0.6 was branched, I have mostly finished the C# port of the docking widget and we have enabled that. This should make building simpler, and will allow us to be self-hosting.
FOAF updates: Trust rankings are now exported, making the data available to other users and websites. An external FOAF URI has been added, allowing users to link to an additional FOAF file.
Keep up with the latest Advogato features by reading the Advogato status blog.
If you're a C programmer with some spare time, take a look at the mod_virgule project page and help us with one of the tasks on the ToDo list!