Ok this thing happened to me yesterday while I was reviewing my adsense account. On my niches diary blog I've got 0 clicks but I earned few cents... How is it possible ?
maybe it is a pay per impression ad. could also be delay in stats! If it is just 1 or 2 cents then probably pay per impression ad.
Actually, if it's just 1 cent, then he got money for impressions significant LESS than 1,000, as there is no one out there paying 1-cent per CPM, which would be a waste of everyone's time.
Take Your time and don't rush from the first moment to get huge amount of money. Bulid, build, build, build this is the key word