Don't worry, nothing is lost. There is indeed a bunch of contributed levels not yet released due to the usual time problems, so everybody should feel free to (pre)release their stuff here in the forum.
Do you think we should prepare to announce the return of Rocks'n'Diamonds now resuming in development outside of the forums and your website, and kick it off with a flood of piled up contribution levels? Most of us have came and contributed being with the game through other sources like software websites. I still remember the time where I couldn't even start up Rocks'n'Diamonds back when I was younger because I have yet to learn how to unpackage the whole game.