PSUbuntu is a community maintained Ubuntu-port and you can help finding and fixing bugs.

If you know how Ubuntu packaging works then you can probably help out by posting any bugs and issues you encounter to the ubuntu-ps3-port launchpad page.

If you are a developer and want to take part in psubuntu development; the ubuntu cell mailing list is the place to be. To get updated on current issues, browse through the archives and check Dan Munckton’s Status Update emails.

For instant contact with developers, use the IRC channel #ubuntu-ps3.

You’ll find more information in this forum thread.