SMIL for slides?

Has anyone developed a system for cooking up presentation slides in
SMIL?  

I can probably get by with SVG (or HTML and a lot of pain), but SMIL
seems like a better fit for the odd extravaganza I'm building for my
Extreme (http://extrememarkup.com/) presentation.

Suggestions on and off list are both welcome.

-- 
Simon St.Laurent
Ring around the content, a pocket full of brackets
Errors, errors, all fall down!
http://simonstl.com -- http://monasticxml.org