Those are really nicely done effects, and I could see finding a use for some of the effects -- but not triggered on hover, I've pretty much given up on anything triggered on hover, because of need to support touch.
There's still a lot of desktop systems out there. And anything you trigger on hover can be triggered on other pseudo selectors (active, selected). I've found hover effects to be really useful on a client-side basis -- I do a lot of restyling of websites to improve readability and usability. One modification I've made is an asymmetrically timed resizing of edit dialogs in the case of Diaspora. One second after entry,…
I like the dialog expanding thing -- but that's not on hover over the text box, it's on click/touch/select/entry into the text box, right? Or you really mean hover? It seems to me it'd be annoying on hover, but maybe I'd have to see it.