For bike locks, the main thing to know (IMO) is that cable locks can be snipped in a matter of seconds and are therefore only for "cafe stops" in low crime areas or as supplements to stronger U locks or heavy duty chain/link locks. Even heavy duty locks can be defeated given sufficient time, so it's simply best not to park overnight outside.
My preferred system is to use a U lock like the Kryptonite Evolution Mini in concert with a wheel/seatpost locking system like the one offered by Pinhead (which locks the wheels and seatpost to the frame using a proprietary locking bolt). If I'll be parking for a while, I'll also bring a light cable lock to add to the mix - simply to make the bike even less appetizing to thieves and if I want to lock my helmet to it too. I also sometimes loop my helmet straps through the rim just to add another level of delay.
Basically, you just don't want your bike being the easiest or most tempting target on the rack.
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