easyXDM is a javascript library that uses available techniques to provide a means of transporting messages and/or method calls between windows in different domains, in short, by-passing the same-origin policy and letting you call methods across the domain boundry. This is perfect if you plan to provide a client-side API (e.g Facebook Connect) on your [...]

Please see easyXDM for updated info! I’ve just completed the first version of my cross-site scripting library easyXSS. It is available at http://code.google.com/p/easyxss/ under a MIT-license. As it is now it supports simple messaging between windows of different domains, but it also supports proxying method calls and results between them making it well-suited for creating [...]