The Gravatar site is a bit shaky at times, I noticed. Please try again – Gravatars are a really nice way of personalizing blog comments.
As for live gravatars, I’m in the dark as much as chipbennet.
If you ask for feedback to decide weather to write a tutorial or not, we must have some clue of your idea.
If it’s animated gifs to be used as a personal face or icon in connection with blog posts, I’m not keen on such.
If a whole page with comments blinks and flashes with strangely colored animations, I wouldn’t try to read it.
Remember the unfamous dreaded <blink> tag invented in a unhappy moment by Netscape Com back in the explosive times of Web 0.7 ??
On another tune – everything fun is worth trying, and will get its good use in due time. So fight for it and give us a clue!