My children had a terrible summer in 1999, when they seemed to pass the damned things between them for months. The only thing that worked in the end was what we called an electronic bugblatter - I think the official name is a Robi Comb - you use it on dry hair once or twice a day and it nukes the little buggers by electrocuting them. Not dirt cheap, but it works out cheaper than months of lotions and potions and really did seem to work - and can be used from time to time whenever you get wind of an infestation amongst kids at the school.

Lots of sympathy, though - I was dealing with super-long hair in an 11-year-old and an eight-year-old, and they made their protests very audible!