The GNOME book is out, and it includes a bunch of samples under the GPL. It might be a good source of information for someone to convert them to C# and put in monodoc. There is a lot of other fun things to do with regards to documentation, so join #mono or post to mono-docs-list and start writing. Most of this can be done right from the comfort of MonoDoc.
One thing that would be great in my opinion is to take small examples, like from the ported GtkDemo, the above book, applications and find places in the API docs that they would fit. It took me less than 30 minutes to do this yesterday for Gtk.TreeSelection, Gtk.DrawingArea, and Pango.Layout. Also, if you find existing examples that no longer compile please let us know (or fix them in monodoc and contribute them).
I think Erik and others have the monkeyguide under control, but I am sure they would like help in some areas if people are interested as well.
Nemerle has a new release, and Pawel Rosanski has been doing a terrific job making it work well with MonoDevelop. Thanks Pawel.