@addison There is a huge site for this, but it requires you to play specific emulator versions of MAME. Other systems or emulators aren't allowed. It is called WolfMame and have several changes in its source code to prevent from cheating. Unfortunately, it is only available to pc. If you still interested in it, go ahead and have a look at MARP site.
Forum: http://marpirc.net/
Database: http://replay.marpirc.net/
But be aware, you can't just enter you name and score without any proof. WolfMame will record an input file and you have to upload it too.
