FolderGlance is a Contextual Menu Items plugin for the Mac OS X 10.4 Tiger’s Finder, which allows you to hierarchically browse the contents of folders in the Finder by right- or control-clicking one or several folders. It comes with a preference panel allowing you to customize the number of levels you can browse, as well as enable or disable display of hidden files.
FolderGlance is donationware, which means that it is basically free. However, for those who can afford it, donations are greatly appreciated.
More info and download link (168 kb, Zipped Disk Image) here.