OpenWRT on the Fon Fonera is one of the most popular posts on this site, however there’s a few rough spots, as it’s more of a set of notes from my own personal experience rather than a polished How-to. There’s several places where someone might fall through the cracks if they’re not using a very similar configuration to mine, or simply aren’t reading my mind.
To improve on this, Brett Hoff and Russell Butturini have made some notes of their own, as in-line comments to mine. to clarify some of the things that have changed in newer versions of Kamikaze and the Fon, gotchas with non-Apache web servers, and a few other things you might have problems with. Those notes are available here.