In this presentation, Prabath Siriwardena, the lead developer of the WSO2 Identity Solution, gives a comprehensive introduction to “OpenID”.
You can find more of his posts about OpenID in his blog http://blog.facilelogin.com/
Jonathan Marsh, VP of Business Development of WSO2, recently released three screencasts explaining the features of WSO2 Mashup Server and how you can use these features in building your own Mashups.
The first screencast targeted at newbies to introduce the mashup concept and WSO2 Mashup Server and the next two videos present you the topics like “Scraping Web Pages” and “Service Composition” which are useful in building advance mashups.
You can view the high quality version of these videos from wso2.org. Here are the links