Now that Google and Yahoo are head-on with their versions of mashup server, what if you want to own one yourself?
Well you could do it in Java. Well you could use the Sun open source lib. for mashup., check out the project Rome. If you are into Apache Axis2, then you could do with WSo2 mashup, which uses apache technologies.
A good startup tutorial could be found here, but i am not too happy with the code quality as there is a lot of scope for enhancements. Never-the-less, it will get you up to speed.
Happy coding :)
