Despite being tacky, the CIA site (below) does provide some useful services, such as its country fact book - a lengthy political, economic and social breakdown of many nations. However, from the corner graphic of a man in a trenchcoat to the questionable kids page, intelligence is in strangely short supply.
This is a nicely self-deprecating site. Yes, it has a database of over 4,000 pinball machines, but it knows this isn't a fact to advertise. As well as tips, for novice flipperheads, there's a catalogue of game tricks and hints, fully animated and annotated.