Follow Matz is a Rails application that lets you crowdsource the translation of a user's tweet stream. It's currently in use at followmatz.heroku.com to translate Matz's tweets from Japanese to English. However, with a few changes you could use it to translate any Twitter user or search, with any combination of source and target languages.
Pull the code: git pull git://github.com/sarahmei/followmatz.git
Add a twitter user: cd followmatz rake twitter:add name=yukihiro_matz
Get the user's updates: rake twitter:update
You can specify the source and target languages. The default is Japanese source, with English target. rake twitter:update from=SPANISH to=FRENCH
Start the server, then check out http://localhost:3000: ruby script/server
followmatz depends on the rtranslate and twitter gems.
sudo gem install sishen-rtranslate sudo gem install twitter
vote_fu and paper_trail are installed in the plugins directory.
The app has been tested on Rails 2.3.4 and 2.3.8.
Sarah Mei. Pull requests happily accepted.