I think this is better than SuperUser because it's focused on Ubuntu, allowing those not interested in Ubuntu to ignore this content entirely rather than spamming it. I think it's better than the proposal you link to for the same reason. Ubuntu forums is a mess, and StackEngine is an extremely effective and well-designed platform for creating a knowledge base. The forums have served us well but forum threads quickly become unwieldy and they do not age well. – David Siegel Jun 20 '10 at 17:40

It seems that it would be best to not have a branded Linux Q&A site. This leaves out Debian (upon which Ubuntu is based), Fedora, OpenSUSE and every other distro. There are certainly Ubuntu-specific questions, but in general, most questions are general Linux-desktop questions. It would be best to have a "Linux Desktop" Q&A site than one per-brand. – miguel.de.icaza Jun 20 '10 at 18:36

I believe that Ubuntu Forums has already proven that a site specifically tailored to answering questions for a single distribution is a sustainable and worthwhile endeavor. There are roughly 1.3 million threads and sixty thousand active users on that website. However, I personally feel that Stack Exchange would be a better medium than Ubuntu Forums for some users and situations, and that even if I or we ultimately end up being wrong, it's still worth giving a try and seeing where it goes. – Evan Jun 21 '10 at 8:27