Hey Steve,
I'm not sure if this is what you're looking for, but it might be helpful:
Even though it's not part of the google site it covers stocks, indices and currencies all over the world. There's a tab in the upper right hand corner labeled "My Portfolios" that lets you customize according to your specific criteria, but as far as screening goes, I'm not sure what kingd of capabilities it has.
I think Capital IQ is a sub of S&P,..... but I've been using it for about a month now and find it to be one of the best screening tools I've ever used. It takes a while, and a lot patience, to get use to its user interface, but once you understand how everything works it makes life a lot easier. The excel plug-in allows you to do even more. I have access through my work but understand that its kind of expensive. So if you don't want to risk purchasing something you're not sure you want to use, you can subscribe for a 30-day free trial....that's what we did before purchasing the service.
Good Luck,
Paul