ctrl-shift-downarrow jumps to implementation. ctrl-shift-uparrow jumps back to the interface section for a given piece of code..
Even if inside a procedure, function or method body, which I think even eclipse can't do.. (eclipse is much younger)
ctrl-space or ctrl-j will open a searchable dropbox.....
Code navigation is way better than in eclipse
and much, much faster....
Project inspector and components inspector also have powerful filtered search/navigate options.....
This is all very well documented.