ZLauncher is the only reason my m130 & Zire 71 are still functional units. The 8MB in the m130 is a nightmare, and the 16MB in the Zire 71 is a serious shortage of real estate. If I had to name the app I can't live without, ZL gets my vote, no contest!
AppIcon doesn't work for the T|X, but for the T|T3, it should be fine. IMHO, it was better than IconsPlus. It lets you import Silverscreen and Zlauncher Iconsets.
Huh. It seems that the files are no longer available to download. PM me if you want it, i think its easier to use than festus' since it reads the existing skin and allows you to modify it as opposed to having to modify individual bmps with the proper "name" in the proper "folders".