+0I'm on the fence. W3C purity is nice and I agree with the theory/philosophy in this case. But I have some concern that some clients/applications might work better with extensions (as I've said, I've seen these issues with media files and browser plugins, but it's been a few years) Search engine placement could also be a big deal and if there were a real effect, I'd value this over w3c purity.
The new URLs will clearly be a major improvement. -- Sean
