||Komodo 3.5 for Dynamic Languages|
I just discovered Komodo. I'm trialling v4.2.1
The biggest feature I've discovered that, if you'll forgive the pun, eclipses the two main rivals I'd tried before, is that it's not built in Java so I no longer have to wait half a second for the GUI to catch up whenever I press a key. Under Eclipse and Zend I would have to continually reboot to clear out rendering errors and instability which resulted from prolonged use. It's not perfect by any means but it beats the other two hands down.