While the old tags still work for YouTube, etc, they are no longer necessary. Along with YouTube, DailyMotion and MySpace, a
whole bunch of other video and audio sites are now compatible with PWH by just posting the URL.
http://espn.go.com/video/clip?id=4360411&categoryid=2459788http://espn.go.com/video/clip?id=4360411&categoryid=2459788http://g4tv.com/lv3/40441http://g4tv.com/lv3/40441I admit I have not experimented with all the sites that are supposed to work (though I had trouble with Last.fm), but all I would suggest is that if you find a video you want to post, try it out. If it doesn't embed automatically, you've already pasted the full link that will take people right to it.
Maximum 12 per page, though common sense ought to dictate fewer than that for the sake of other users. To prevent a URL from being automatically embedded, use "noembed" tags like this:
[noembed]http://www.youtube.com/watch?v=rfp7FbsnsbU[/noembed][noembed]http://www.youtube.com/watch?v=rfp7FbsnsbU[/noembed]