"They’re looking for participation from "anyone who has grown up speaking English in America or Canada". All you need is an internet-connected computer with a microphone and a web browser that can run Flash. You participate by connecting to a Flash application that gives you prompts and records your responses.
They ask for basic demographic information, but participants are of course anonymous. This is a great idea, and I certainly encourage participation. Check it out!
If you’re an English speaker from outside North America, hang on, I expect that they (or others) will get to you soon.”