Stetic Lluis completed the work in Stetic, the Gtk# GUI designer, to support menu and toolbar editing. His work is based around Gtk+ UIAction/Action/ActionGroup, which takes advantage of the new features in modern Gtk+'s.
MonoDevelop hosting the updated Stetic GUI designer.
Read his full blog entry for further screenshots and explanations. The code is available on trunk.
MonoDevelop and C# 2.0: on the same blog entry Lluis talks about the integration of SharpDevelop 2.0's NRefactor code. This means that MonoDevelop will now do proper completion and parsing of C# 2.0 projects (Generics, anonymous methods, partial clases and so on).
Zac Bowling: has two interesting posts this week: his progress on Mozilla embedding. His post describes his work to give us finer control over embedding Mozilla in our applications (in particular to implement Windows.Forms's WebControl).
He also has a very nice post about uses of Mono beyond running your application on Linux and tips for .NET developers.
Google announced Picasa running on Linux, I agree with Robert Love's opinion that using and improving Wine was the right thing to do for Google. Wine and Picasa stability and performance are very impressive.