I believe some of you participating here will be interested in this..
The Semantic Discovery System V7 Releases 0 & 1
Providing Optimally Performing SPARQL Access Over Multiple Distributed
And Heterogeneous Data Sources
A web based copy of the intro email I would send is here:
http://www.insilicodiscovery.com/v2/Emails/SPARQL_Everything.htm
Regards, Ian Goldsmid
Semantic Discovery Systems
http://www.SemanticDiscoverySystems.com