Most kneeboards these days come with this sort of information printed on them, e.g. morse, transponder codes, interception procedures, RT calls etc.
Good idea though to have frequencies, telephone numbers etc. noted on the Plog as part of pre-flight planning. I tend to take a photocopy of the destination aerodrome AIP entry with me too, handy for freqs, tel. nos., circuit procedures, taxiway layouts etc.
Smithy