I am new to Cocoa development and I am trying to create UI layouts using what I consider to be the \"standard\" layout that is shared by apps like iTunes, iCal, iPhoto, Bill
The hierarchical view on the left is called a Source View and you would normally create this with the NSOutlineView class.
Have a look at Apple's SourceView sample code. It implements a source view very similar to the one in the Finder and elsewhere and should give you a big head start.