Here is a link to a thread on the same subject from yesterday with links to sites that talk about guitar maintenance/cleaning.;
http://69.41.173.82/forums/showthread.php?t=150468
Bottom line, your fretboard does not need "maintenance", "feeding", oiling, etc..
Wipe it down with a clean cloth after playing and when changing strings.
Maybe once a year a few drops of mineral oil on a clean rag wiped onto and then removed from the fretboard. A light brush over with 0000 steel wool.
You will potentially do more damage to your fretboard with constant applications of oil/cleaners/whatever than if you just leave it alone.