This plugin integrates the Google Ajax Language API to jQuery. You can just call e.g. $('body').translate('en') but provides callbacks for each translated element too. Or you can pass an array to $.translate to get back a translated array. Currently you can only send a limited amount of characters with the raw API per request but this plugin calls them consecutively. It also reduces the number of requests by concatenating elements and doesn't send unnecessary html markup still providing access to each element as they've got translated.
Please use the bug tracker on the Issues tab if you encounter any problem!
download builder for version 1.4: http://jquery-translate.appspot.com/
The file in the download section is for testing only, it contains all the components, which is unnecessary in almost all cases.
Most important changes in 1.4: http://code.google.com/p/jquery-translate/wiki/Upgrading