Backlift's Tunnel API: connect to 3rd party APIs without JSONP (opens in new tab)

It's just a proxy, you could do the same with a single line of PHP, e.g.: <?php readfile('http://api.example.org/?key=APIKEY&action=' . $_GET['action']); ?>

You can use YQL for this and many, many other operations that you would normally not be able to easily do on the client. It is free, deployed in 5+ datacenters worldwide, will cache both directions, and widely used by Yahoo so very unlikely to be turned off. It even offers persistent storage.

http://developer.yahoo.com/yql/console/

This article would be easier to read if it started off with a quick overview of Tunnel (creates a path in your app that proxies to another site), rather than the how-to. A couple of sentences in the first paragraph would do it.

It's sort of like http://getr.ws/ but bound to a specific application platform.