Perhaps slightly off topic for this forum as it's Amiga Scene stuff, but the winning old-school demo at Revision 2013 was Rink-A-Dink REDUX by Lemon, available from here.
More on topic is the fact that the original version of this demo used to be a real pain to try and get to run on WinUAE and interestingly, for you Amiga programmers and emulation purists, there's a stack of text at the end of the demo about the changes required for WinUAE over a stock A500 (might be of some interest to Toni) along with a few hints and tips on how the effects were made... cool retro stuff
P.S. I thought about hacking the text out using Action Replay & WinUAE, but then I realised I didn't have an Action Replay ROM... and my hacking skills wouldn't know where to start with compressed text on disk. Maybe some kind demo fan will attach it to this thread, but you should take a look at the demo anyway if you want to see some fast A500 code