Eclipse has great function 'Link with editor' which synchronize "Package explorer" (Project Explorer in NB) with 
currently edited file. When I switch to another opend class, Eclipse open tree with this class and select it. I 
instantly know where this class is stored and I can open another class in the same package. It's very usefull. When I 
have open more file in Netbeans and often lost orientation, where class is. For example when in project exist more 
class with the same name, but in another package. Also this is very usefull for develompent in Wicket framework which 
has .java and corresponding .html file in the same directory.

Netbeans doesn't have tool menu like Eclipse in Project Explorer, but this option can be in context menu od at the 
bottom as button like in Navigator windows.