We had them early this summer, and this fall there is a big outbreak around here. I keep hearing about different kids with them. I check my kids at least twice a week now.
They are resistant to RID and NIX. Please, do not depend on these products and the 7-day delay they advocate. You will just frustrate yourself. You can use the pesticides, but you also have to comb/pick nits at least every two days!!! The spray products don't work (there are studies online) and just spread pesticides around your house. Vacuuming and washing is fine.
The method that finally worked for us to get rid of those last eggs/bugs is described on www.nuvoforheadlice.com. Messy, but I swear it works.
Earlier mamasource post on lice is here: http://www.mamasource.com/request/3245383460717592577