Where should you go for open source support?

An interesting story and discussion on ZDNet:

If you’re taking software free and buying support from elsewhere, the guys who built the program can’t eat, unless they find a way to get a rake-off from the support team’s revenue. Which isn’t going to happen. Or start charging you directly for their code updates, which might.

It would be interesting so see ideas discussed there apply to Firebird in any way.