Hi,
 I've just finished off a simple Space Invaders using processing; you can find it here:

http://www.treblig.org/siprocessing/

It's a port of a Javascript version I wrote a couple of years ago which can be found here:

http://www.treblig.org/si/spaceiv.html

I did try and set up the Processing version with John Resig's Processing.js; it almost works but for some reaosn I don't seem to see any of the bases (that the Java version gets) and I get a complaint about fonts - I assume the font complaint is due to to the way fonts get named in Processing?   Anyway that version is:

http://www.treblig.org/siprocjs/siprocjs.html

Processing does seem to be nice and easy and have very little overhead; certainly less painful than Javascript!

All comments welcome!

Dave