I discovered lice on my dd about 3 weeks ago, and was horrified. My main worry was whether I'd failed to notice she'd got them, and she'd been uncomfortable for ages.
Getting rid of them seemed relatively straightforward, although we did resort to the louse shampoos (dd has severe eczema and the conditioner trick therefore makes things much worse). We found a good lotion that is kind to sensitive skin (and good for asthmatics, which was helpful as dh is, and he needed treatment too).
After we'd got rid of them, my MIL, who was looking after dd for a few days, got a recommendation of a homeopathic treatment from her pharmacist (Mother Earth). She just bought the 'post nit' bit of it - really nice drops containing tea tree oil, lavender etc., which you add to the rinse water after shampooing. There is also a preventative shampoo though. Has anyone tried this - various books I read on the subject seemed to suggest that preventative lotions don't work? Also, as I'm pregnant at the moment, I wasn't able to use the louse lotion - has anyone got any recommedations on stuff I could use, if I find I've got them (no sign yet, but I feel itchy when I think about it!)
DD's nursery (where I'm assuming she picked them up) were great, and just posted an anonymous notice alerting other parents. They washed all the dressing up clothes, including hats, but dd didn't have to stay away as we'd already taken steps to do something about it. They did thank me for telling them though - apparently some parents don't bother.
Given how much extra work was involved, combing through each night, washing all the bedclothes and towels and soft toys etc. I personally think it's irresponsible of parents not to let nursery /playschool etc. know. Everyone appreciates that it's really common, and that it's no one's fault, but people do have a right to be informed so that they can keep a look out. My approach was to let friends and family know, so that they could do this.