Frequency - as often as possible while still recovering.
Load - as high as posisble wihtout compromising form.
Volume - low. Runners do not need huge volume in a strenght workout (i.e. doing 12 reps is pointless -- it's not heavy enough to make you significantly stronger.) Heavy reps in the 1-6 range would be more suitable. Why? Becuase the strength adaptations available from strength training are neurological and or musclar hypertrophy. Opportunity for the latter will probably be neutralized by the vast amount of aerobic training and diet of a runner (i.e. not a huge and consistent surplus of cals), so you get stronger through neurological adaptaions, which you don't get from messing about doing 4 sets of 12 reps.
Good exercises - squat, deadlift, box jumps, olympic lifts and variations (e.g. power clean), bench press, rows, overhead press, pull ups, dips... etc. Core work, if you feel you need it.
Crap exercises - biceps curls, leg extensions, pissing aorund on a bosu ball kidding yourself that it makes you stronger, and any other silly exercises and or isolation exercises stuff that has bugger all crossover to running and or is wasted recovery that could be put to better use.
Edited: 31/10/2012 at 13:20