I’ve been collecting together various icons I’ve (I hesitate to use the word “designed”)… made. The process is sluggish, because in many cases I’ve never done more than a 512x512 version—I’ve just let Mac OS X, in some cases with quite poor results, scale them down when needed.
As I do them, I’m putting them all in my public iDisk folder (in Finder, just choose Go → iDisk → Other User’s Public Folder…, and enter my MobileMe username: mo.mcroberts).
I’ve also uploaded the PSD I use as a template. It’s nothing particularly special, but some might find it useful. It’s based upon a screenshot of Icon Composer, and sliced so that when you Save for web & devices… it outputs sensibly-named PNGs for each size, and includes some convenient background layers. Go crazy.