My ever-changing collection of useful and probably messy Actionscript and Java classes can be checked out at google code svn:
Pile of Actionscript 3 classes.
I tend to use the Logger class that’s in there much, it’s a simple static event dispatcher inspired by java.util.Logger.
Also, some people doing flash games might want to check out the A* implementation i did. Although there probably are many faster and more flexible implementations out there, I found mine simple to use. Oh and it’s probably not fully stable, but it worked well for what I tried to do and some people seemed to like it 
Couple of Java (1.6) classes. A part of it is using JMonkeyEngine (you should check that if you want to make games and use Java) Nothing too serious here, but some things could come in handy…