I would like to know if there is any explicit size limit to preferences set with setPreferenceForKey() method. I've checked around the Web Developer's Library but without results..
Really thanks for your answer! I had the same impression, but could not be sure about it because of the absence of explicit references..
Anyway, this is surely a great thing, expecially if performance is good as you say!
just out of curiosity, have you tried loading xml formatted data into the value of a pref variable?