In iTunes, applications pane, control+click an app, and choose "Show in Finder".
OS-X has so many extremely helpful features that I would never even think to look for in Windows.
Best tip I have gotten! Thanks! Works for Music too, so I presume it works for everything. Thanks again-It is taking me a while to convert from opaque Windows, but it is worth it. OS-X has so many extremely helpful features that I would never even think to look for in Windows.