Xdebug, PHP in NetBeans, etc...
Re: Peter, did you check out this tutorial to see if it helped?
And thanks all for the initial positive feedback. I work on the NetBeans IDE, and we will be adding FTP support as well as a list of other improvements (can check out wiki.netbeans.org for future plans). Please pass along feedback- we went with an early access to get the conversation started on how we can make this a first rate tool for PHP developers.