Finnally, I had time to commit an alpha version of a GtkSourceView plugin for anjuta. Of course it is incomplete but anyway it works. Here is some screenshot:
I also tested Xgl but it is way to slow in the moment with my Centrino graphic chip. Anyway, it really looks great and promising and I hope that performance will yet be improved. Of course it is totally useless but who cares if you can impress Windows users ;-)