Multi-tags working, using youtube and vimeo

Hey, I decided to go with vimeo, I guess they're ok, and popular, therefore it's probably the best choice.  

There's some junk in there about stack overflow too deep.  It turns out that by using recursion we have a finite limit to the depth to which we can stack tags.  It's not a big deal at all, but a while back I gave it a lot of attention for some reason.  You need to nest over 1000 tags deep in order to produce the error, so its not very realistic to occur in the wild.