Having a click around on youtube tonight I came across a video of probably the greatest VIC-20 demo that has so far been created.
For those of you who don't know about it, Robotic Liberation runs on an unexpanded Commodore VIC-20 and features some great visual effects and quite madly it also has synthesized speech! Well, after a fashion. It's not something you would comprehend easily without the words being on screen.
Anyway, if you haven't seen this demo before then I can assure you that it is far greater than you will be expecting is possible from a VIC-20.
Video can be viewed http://uk.youtube.com/watch?v=2SdGkkp1aq8
But I recommend you download the proper demo from Pouet and run it in an emulator as you won't get the full experience or clear visuals otherwise. The Pouet page can be found at http://www.pouet.net/prod.php?which=10626