Spoiler for Screenshot:
Someone wanted me to make a guide for my new setup so... here we go..
So, I heard that you want Vista/XP to look like Leopard? Here's what you need, first of all...
Spoiler for Application/Resouces List:
Here's what I have shown for vista.
Objectbar theme - Leopard perfect by Chaodam
Windowblinds - mac os x leopard 2 by blitzr
avetunes (coversutra) - ???
Dock icons - japanicons/mix
Miranda IM - Twitterrific (Not For release)
Firefox - foxdie by ???
These are just the basics of emulating the mac's look. If you wish to go farther, you may have to spend some time tweaking (epecially if you are on windows vista like moi.)
For those on XP, your options are much more broad. You can use Findexer, and Styler to further refine your Mac look. Even so, you have to use WindowsFx if you want Drop shadows.
Here's an example from the great PerfumeNK, who I admire very much. ^_^
I know that it isn't exactly super extensive, but I'll be updating with new links when something comes up.
Spoiler for Skins/Extension applications :
Spoiler for What's new?: