A couple of google search later, I eventually came to a solution that involved converting feeds into RSS using a XSLT stylesheet. Nice !

OK, this was only half of the solution :-). I had trouble making emacs display rss correctly and eventually finished by hacking my configuration quite heavily and overloading some nnrss functions.

Yeepee, know I can syndicate the whole Internet in my Gnus folders. Step three is to find some time to read new feeds !