FolderGlance is a small Contextual Menu Plugin for the Finder. When it is installed, it allows you to control-click or right-click on folders to see and open their contents, as well as examine the contents of sub-folders down an unlimited number of levels. FolderGlance also has the following features:

Adding your own custom folders to the contextual menu, enabling FolderGlance to act as a very versatile launcher
Moving, copying and making aliases of the currently selected files in a folder you browse to
Control-free popups: Open the contextual menu without holding down the control-key or using a two-button mouse
Drag-and-drop of files and folders
In-menu preview of arbitrary files
Opening files with an application different than the default by using an "Open with..." menu you can tailor to suit your own taste
Changing the font size used in contextual menus
Disable the menu fade effect, for a more speedy menu experience
Browsing into package contents
Optional display of custom file and folder icons
Customizable sorting and customizable display of hidden files and folders
Trash files directly from the contextual menu by typing Command-Backspace or Command-T
Localized to Japanese, French, Polish, Italian and Norwegian.
Universal: Runs on both PowerPC and Intel-based Macs!