Good implimentation of media RSS, as mentioned you should include filesize and since you have it, copyright information. the transcript, description or any textual information,

I really recommend including the standard RSS "enclosure" tag for backwards compatibility to standard RSS, and putting the mp4 or another downloadable format in it, since flash is generally not a great podcast format.

Also, I really recommend putting the downloadable format MP4 first as an <item> and the Flash file second since some agregators may by default attempt to download the first item.

Finally, this may just be iTunes, but if I'm not mistaken "&" is not a valid XML character and will therefore invalidate the whole feed.  I ran accross this recently when experimenting with enclosing google videos in deli.icio.us feeds. Took me a hell-a-long time to realize it was the & in your url string that was causing it the feed to not work in iTunes. Even if this is just an issue with iTunes, that's still a significant portion of market share. It would be great since google supports mp4 to be able to pop a feed in iTunes... it would seem like google, itunes, and the iPod would be a perfect combination.

The big issue is the way your servers are set up. It'll be interesting to see if aggregators can download your videos because of

a) the url strings, particularly the use of "&"

b) the lack of extentsions on your URL, thought technically not improper

c) the fact that your servers force a download prompt. This very well might fowl a lot of aggregators.

Finally, just for the hell of it I popped your feed into mefeedia.com , an online video aggregator for the vlogosphere and while it properly recognized the flash items they would not play.

http://mefeedia.com/feeds/6985

I got the following error message when I hit play, "this video is currently not available, please try again later." Not sure why that is. Perhaps some sort of referral issue or perhaps the url is improperly referenced. I'm not sure which, but either way it would make a tremendous amount of sense for you to allow your videos to be referenced from other sites for just the same reason as it makes sense to allow them to be referenced in RSS. Wether it's just video bloggers or people wanting to talk about or discuss a video re-blogging is a core factor in the virality of videos, and when you can ensure a fair amount of linking and interactivity back to your site through the flash so the media is not orphaned there's no reason not to allow it. Despite all the problems with youtube they've shown this single strategy to be sound... promote your links, promote embedding and reblogging, promote distributed discussion. Google at this point has none, no discussion, no comments, and even if it's a game you do decide to get into (I'm guessing not due the infinite granularity of liabilty and moderation) having one thread of comments on a video cannot offer the variety of conversation... allowing re-blogging, hotlinking and embedding just as with RSS will allow for nearly infinite discussion on a video, discussion which for the purposes of search google will benifit directly from without incurring the costs of moderation and liabilities.

Peace,

-Mike
mmeiser.com/blog