I just found out that my TechEd US (June 2006) presentation is available online here. (not sure how long it will be up there)
Note that it was one of the very first times I presented our SaaS work, so things have changed a little bit since. This said, (even though I do not remember everything I send then) there should be some good bits :).
If you don't want to see the entire presentation, you could decide to just have a look at a very simple demo, I presented in the session, illustrating concepts around multi-tenant data and workflow management. It's 36min. into the session, you can click directly on the "High Level Scenario" slide.