I\'d really like to get deeper into my php scripts and use things like breakpoints, as I\'m doing with JS with firebug.
I\'d like to know more about what techniques
Use XDebug, it does most of what you require (not network/filesystem), and with it you can debug from eclipse, zend studio, pdt, or even notepad++
I keep debugging again and again when dealing with Magento, and it is super useful in this case, since Magento's function call stack is very deep.