In my periodical running of the query http://www.google.com/search?hl=en&lr=&ie=UTF-8&oe=UTF-8&q=grid+computing+%22.net%22+ogsa there's a new result worth noticing: there is a Tech Preview of an OGSI.NET hosting environment that supercedes a previous HTTPG implementation. And guess what? It leverages WSE for security :-)