I'm submitting to the monodoc (http://mono-project.com/Monodoc) mailing list a patch that gives persistent hierarchical bookmarks to monodoc. Hopefully this will get approved and merged upstream soon...
The patch took a lot longer than I first had planned since dealing with something like hierarchical bookmarks is not as trivial as one might think...
Since some poeple say a picture is worth 1000 words, so here it is:

I apologize for the ugly cropping but for some reason I could not get Gnome snapshot to work correctly.

- raf