There is a cool project that my company (Rackspace) has opened sourced called Repose. It is a proxy for ReST APIs that, among other things, supports rate limiti

There is a cool project that my company (Rackspace) has opened sourced called Repose. It is a proxy for ReST APIs that, among other things, supports rate limiting in a clustered environment. It's still pretty new, but we use it internally and might be useful for people writing APIs. You can find it on github: https://github.com/rackspace/repose https://github.com/rackspace/repose