Every Ubuntu user can participate in the Ubuntu community. Here are some starting points for people who want to help shape the direction that Ubuntu takes.
Here’s an interview with the Simon Law. He’s Ubuntu’s head Quality Assurance guy. I met at the UDS in Paris and he’s a nice guy.
f you’re new, you can join in the “Hug Day” in starting on Wednesday, 19 July, in every timezone. For more information on how to get involved, Jeremie Corbier has a nice summary of everything you need to get started.
If you want to help with testing Edgy then this thread contains some interesting information.
If you have ideas for Ubuntu then this thread contains some interesting information.
You can also help supporting Ubuntu users on the forums.