I've been using the 4.0 beta series for a few months, now, and it's pretty sweet. It's my current PHP IDE of choice.
Accompanying Komodo IDE 4.0, is the new Komodo Edit, "a free, multi-language editor that makes it easy to write quality code."
Congrats to Shane, Jeff, and everyone else at AS. Hopefully you'll finally be able to get a reasonable amount of sleep in the coming days.