Cool to hear someone else is continuing to spread songbird! :) Actually, check out this bug:

http://bugzilla.songbirdnest.com/show_bug.cgi?id=10666

That's the upstreamed patch I gave them for the linux-ppc config statements. Honestly, that's all it needed since the internal builds (such as mozilla) already compile on ppc. Of course, there might be one or two snags that are different in Ubuntu.

Feel free to send me an email if you get stuck in the build process. Take a look at the Fedora 9 spec file link above if you need some hints.