Someone I work with at Liip wrote this script that does the following :

• Looks for all input fields in a form and rewrites them to be larger, with language links at the bottom, when you click on each one, you can edit the string for that language

• There's also a 'src' link that gives the source of the multi lang tags.

At the moment, it's a matter of pulling in the js source in header.html, and then the following in footer.html:
InputTransform.setLanguage('<?php echo current_language(); ?>'); InputTransform.init();

I think this would be really awesome to have in 2.0, with an option to turn it on, or off, of course, and maybe configure which languages it lets you edit.

I would advocate it being added to mforms (or whatever replaces them in 2.0)