I recently created a wiki page devoted to getting input on what people would like to see done in JBoss AS Clustering, and in the AS in general, over the next 6 to 18 months. I'd very much welcome your input; please see:
http://www.jboss.org/community/docs/DOC-13209
It's a wiki with comments, so you can add your own wish list items to the page itself or use the comments section to comment on items already there.
Cheers,