3) Another package I had to install from the command line: python2.5-runtime. I don't understand why these don't show up in application manager.
I admit I'm a little worried that these standard Python modules were not present. It makes me wonder if I have mis-configured something, since Python is generally a "batteries included" setup. However, the fact that I got TreeLine to run successfully gives me some confidence that I haven't gone too terribly wrong.