This is a little off topic, but since there are plenty of wireless users here and maybe some people with some regulatory/legislative sense, I thought I'd ask. (Out of interest, rather than current necessity, although a decent answer might give me a clue of whose counsel to seek should I ever need to know).
What record-keeping responsibilities does a business running a WiFi hotspot for its customers have? They're effectively acting as an ISP, but if they're not keeping proper logs then 'customers' could perpetrate computer crime and be traceable only as far as the business's internet connection (for which they are responsible, of course).
Matthew