Getting back to locks, I'm liking the Abus Steel-O-Flex/Granite cable locks.

Cheaper than a Fahgettaboudit chains, but with very decent level of protection. It's much easier to lock up to poles/racks with this and its about half the weight. Its also very comfortable to carry around waist.

Most of the time I use this and leave my Krypto chain at home. But then I now live somewhere now where most folks seem to lock up with bits of string.