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Quick Look is easily one of the most useful new features in Mac OS X 10.5 Leopard. Being able to gracefully view the contents of a file directly from the Finder is something that any user will find useful. However, some users began to notice that using the Quick Look feature on non content-based items, such a a folder provided little more than a giant sized icon, when it could be doing so much more.

Developers from http://d.hatena.ne.jp set out to address this issue by releasing two new plug-ins for Quick Look, one for folders, which displays the folder’s contents, and another for ZIP files with also displays that hidden contents of the zip, without actually unzipping it. Installing these plug-ins is as simple as downloading them from the developers website and putting them in your ~/Library/Quick Look folder. If you don’t have a ~/Library/Quick Look folder, just create one. Once you have installed the plug-ins, restart to ensure the changes take effect.

NOTE: It’s a little slow when the first time you Quick Look a Folder/ZIP but it doesn’t persist. Seems to be the initial load delay. It’s very snappy now.

Folder Quick Look Plug-in (Direct Download)
Zip Quick Look Plug-in (Direct Download)

also…

FLV Video Quick Look Plug-in (Direct Download) - Thanks to Bill for sending this in.

Developers Site