There is also a listing on the SketchUp downloads page: http://www.sketchup.com/?sid=37
This was finally updated last week. I sent them updated information on RPS products in February, but the new page was delayed - apparently because they wanted to study some legal problems.
I sent them updates on RPS products again last week, and they are supposed to update the page. As soon as they do, I plan to start a new thread (with a more appropriate title then this one) to let other people know about the plugins page. (We have renamed and consolidated some products, so the new listings will help send people in the right direction.)
Currently, there is no way to find this page unless you happe to stumble across the old SketchUp home page: http://www.sketchup.com/, but I believe they are working to get a link to it from the Google SketchUp home page.
Al Hart