Rolf has just commited the patch to make VBNC self-hosting, the goal that he was aiming for as part of the Google Summer of Code.
VBNC is Rolf's Visual Basic 8 compiler written in Visual Basic 8, the one that we are using to replace Mono's current mbas compiler.
From his patch:
2006-08-19 Rolf Bjarne Kvinge
* Bugfixes: The compiler can now bootstrap itself!!!
In other news, the new VB runtime has been checked into SVN, in the module `mono-basic', this runtime is also written in VB8 unlike our previous attempt which was built on C#.
Rolf's compiler is able to build this new runtime as well.
The details of the new upgrade in Basic handling in Mono are here.