Good icon editor or graphic-to-icon convertor?

[MDesigner]

I've tried a couple icon editors but the end result is either very jagged or crappy looking when it's sized down to whatever size icon goes in the system tray. Anyone have any suggestions? I'd rather design icons in Fireworks or Illustrator, and then convert them to .ico format.

Thanks

 

[theAnimal]

You may find what you need here.