I don't know if this is already known but for any Mac OS X 10.3 users, I wanted to mention that Readline 5.0 now compiles out of the tarball, using the normal "configure,make,make install" commands. I just verified this for myself by building Readline 5.0 and SQLite 3.0.8 on my PowerMac G4. I have also posted this on the Wiki.
So, Fink is no longer needed just for Readline if you have the Developer Tools installed. :) -- Jeff Flowers