Hello
I will be presenting the paper on SMash which is an implementation by IBM to answer the problem of secure cross domain mashups. There is an additional paper written by the authors called a research report which goes into some more detail on the implementation. It is linked on this web page below
Also there is an updated version of the conference paper we are reading. There only difference I can see with the updated version is that they add a few paragraphs addressing a criticism of their link integrity given by Barth et al in Securing Frame Communication in Browsers
IBM has donated SMash to the Open Ajax Alliance which has not yet integrated it into their Open Ajax Hub but the source code and some demos can be found here:
http://openajaxallianc.svn.sourceforge.net/viewvc/openajaxallianc/hub/trunk/sandbox/smash/src/
Thanks