XWIZBT2056  It's certainly better than I could do, but I'm sadly unimpressed. It's a bunch of five semi-transparent images that bounce around the screen. They don't even bounce in a realistic fashion. I remember making bouncy things like this on my Spectrum in the 80s...  (Version 0.2)

GAZMAN  This is my favourite screensaver from Vista (possibly favourite thing from Vista) so was glad to see a port to OSX. However, you only get about ten or seconds before the bubbles fill with dollar signs and an unregistered notice. $2.50 isn't much so I might think about it, but at the moment its only an early beta.  (Version 0.2)