Just to emphasis the long post...
"Unlike others, (un)Official Google Translate API allows users to translate selections of text by including them in a SPAN tag and with class “t”. Of course, like most of Google’s web APIs(though this is unofficial), this one requires you to include a JavaScript file to the pages that you want to translate as well(you will also need to upload a server-side file). So is it going to take longer to download the pages that included with the JS file? No, it won’t, because the file is so small – less than *800* bytes".

A demo is better than a million word.
http://googlified.com/api
related blog post: http://googlified.com/2006unofficial-google-translate-api

Wow, nice job :) Looks pretty cool.