Buy Your Mate A Beer

I always loved this idea at Photonflux. I also do the odd pay it forward coffee - I've been the recipient of one and it made my day.

Tracking your library requests and overdue books

If you're in Christchurch, Wellington, London or Chicago the Library Elf web site lets you receive your overdue notices and reservation requests using RSS. Wicked!

(hat tip to Fraser for the link)