Fotogeluid, I'm sure they (we...?) would join if your site didn't look like a clone of an earlier NG or Mochi, but it's pretty clean right now.
Can I make a request for your site layout that no one does yet and it would be kind of a killer app for you? Make the entire design completely eliminate scrollbars except for in the div the immediate content is in and make that borderless all the way to the very edges of the browser window. This way flash developers could implement the mouse scrollwheel in game and players could trust that to work well on your site. It would be a good inbetween regular webpage content and fullscreen.
By the way, I'm joining your site because you mention stencyl, scratch and...what is sploder? Thanks.