One of the things I noticed when I was in Copenhagen for a week earlier this year was that people don't lock up their bikes as much. I saw lots of people leaving bikes unlocked when going into coffee shops, etc. when in the UK they'd be locking 'em up.

There were many bikes that were locked - but they looked more like "commuter bikes" near the metro and office buildings. Folk using them to get around during the day often seemed to leave them unlocked.