Open Source mailinglist?

Hi there! I hope you don't kill me out there, but I'm totally out of luck here. I've been doing some research on Open Source questions because I want a product of mine to become better in any ways (yes, it's written in PHP and yes, it's Open Source). Because of not doing advertising here, I'll skip the name :-) I can't seem to find any place on the net where you can discuss Open Source-related questions in general??? Best regards /Gustav Wiberg