Miguel de Icaza posted a list of areas that we are working on for the Mono 1.2 release. Mono 1.0 has been fairly stable, they will likely issue a bug fix release in the next couple of weeks.
Mono: Post 1.0 Plans and Development Update
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Eugenia Loli
Ex-programmer, ex-editor in chief at OSNews.com, now a visual artist/filmmaker.
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There are a number of areas in which we are focusing for the Mono 1.2 release:
* Gtk# improvement and GUI designer.
GUI designer, yay
Now I wish someone ported WebMatrix to Mono 
IMHO the best way can be the extension of Monodevelop to full RAD tool (integrated debugger, GUI designer like SharpDevelop and web forms designer).
Yes I agree.
I wonder if the GUI designer expected for Mono 1.2 will be integrated with Monodevelop or a separated program.
there was a very interesting thread about GUI Designer. [can’t find the link]
search for it!
about WebMatrix, if Windows.Forms are ported to Mono, then it *WILL* run WebMatrix. [Miguel wants this to happen, from what anyone can read in his blog]
Thanks for the tip Nikos, I think I found it:
http://lists.ximian.com/archives/public/monodevelop-list/2004-July/…
But the information there is not very exciting, I hope it changed in the last weeks:
>(…)I read at several places that there are plans for a new Gtk# GUI Designer not based on Monodevelop but I was under the impression that the work on this is not really started.
That’s correct. I’m the person who’s going to be hacking on it, but I’m still busy with Evolution 2.0 stuff right now…
> Are there any concrete plans about the design of such a Gtk# GUI Designer?
Yes. I’m hoping to combine the best ideas from a bunch of different GUI designers (mostly Glade, the Visual Studio forms designer, and the NeXT/OS X Interface Builder, but I’ve looked at a bunch of other Tk/Motif/Qt/etc GUI designers too.) One of the big problems with Glade
is that the Gtk box model sort of forces you to plan everything out in advance, and if you change your mind about the layout, you often have to completely tear everything apart and rebuild with new boxes. I want to
make it so you can just lay out the widgets, and have it automatically figure out the right set of boxes for you.
> Is there a time schedule?
No