i just went by Apple's AppleScript page for OS X and found that you can in fact still windowshade finder windows. well... sort of, that is. :)
go see for yourself: apple's script examples
maybe one can try to alter the script for other apps, compile 'em and then, using script runner, windowshade'll be back. :) i know, i'm dreaming...
[Editor's note: Marcus, I don't think you're dreaming. If they left the capability in the system, then I believe someone will be able to write a windowshade application, if nothing else. That would make some people very happy! To test these scripts, copy/paste them into the ScriptEditor application in the AppleScript folder]
The above-referenced Apple page no longer exists. However, using the Wayback Machine
, I was able to find the original scripts; they're now listed in the rest of this article...