Let me start by disclaiming that this whole post might be meaningless if I'm making an incorrect assumption about how WindowsXP treats icons...
But I'm supposing, at least from the look of things, that XP anti-aliases the edges of both desktop and folder-level (what you see in an Explorer or My Computer window) icons. This opens the door for some awesome and beautifully unique icons.
Does IconPackager (or will it in the future) support the anti-aliasing of hi-color or true-color icons in conjunction with WindowsXP? And if so, what method needs to be employed to get it to work correctly? Will an icon made with a transparency-mask, like the ones used in DesktopX, show up anti-aliased in IP? Are there plans to incorporate this if it's not already in place?