Not only is the catalogue online you can also use the system to reserve and renew books online too - so no more overdue fees. I've been using this for a couple of years now and it has saved me a small fortune.
The whole geek side of the office were coming up with obscure things to search for and the bloke next to me is American with a supposed Americanised Cornish surname (small hands too). We were teasing him.
I think you could make a drinking game out of this. If they have a book on it, you drink.
Just noticed I had a message from Diana Edmonds, Head of Haringey Libraries to tell me that this service had 50,000 transactions last year in reservations and renewals.