Great tool from Google - Google on-line translator has also AJAX interface.
It allow you to use all it's capabilities in your software development. This means, that we can easily use 52 language-to-language translation for free :)

Here is a little python module, I used in elviv.com to create English descriptions for places on the city map. Module is alailable for free use.
http://www.djangosnippets.org/snippets/1934/