I don't think there is a single "almighty solution". There are many tools and
features that can help with code management, depending on what your needs are.
Here are some suggestions:

*	

	Search for "project" on Emacs Wiki.
*	

	Among other things, Emacs tags and Bookmark+ tags can help.
*	

	http://www.emacswiki.org/emacs/Icicles_-_Support_for_Projects

Others will offer additional pointers no doubt.
 
There are many ways to manage "projects" of code, and Emacs offers many features
that can help with this. It's up to you to decide how you want to do things and
which features are most useful for your needs.


I use more and more emacs for my hacking activities. I am more used to Netbeans
and Eclipse IDEs but the possibility to do anything from only one editor
attracts me....

One thing I miss however currently is the possibility to organize my files as a
project. Typically if I develop a PHP application, I'd like to be able to
a)navigate in the current file to jump directly to a class' member (either
variable, function, whatever) and b) jump into a dependency, this can be a
superclass or a class from a library I use, anything. Doing that from my beloved
IDEs is very easy, but from Emacs I read about tags, anything and certainly
others... 

My question is: is there an "almighty" solution?