Jean-Marc's slides for his Europython 2005 talk are now online.
One great thing about his talk is that he's come up with a "Top 10 reasons to use CPSSkins" which are:
One can read more background information about CPSSkins in Jean-Marc's last year talk (but this was before the introduction of portlets into the framework, so things have changed quite a bit this last year).
I think that CPSSkins doesn't yet have the success it deserves, probably because people don't yet get the whole advantage they can get from using it, and this is a shame because it is really a terrific product.