Thanks for the advice, everyone!

I think I'll try the Borax, as well as continue with the Frontline Plus. It really seems like the kitties are scratching less and I'm scratching more, so the fleas are probably nesting in the carpet.

I really don't like the idea of the foggers. I had considered it, but realized that whatever is in the fogger is going to be all over everything in the house, including the kitties beds, our beds, furniture, etc. I would hate for any of us or the kitties to wind up getting sick from it. Also, the vet said he doesn't like the idea of foggers for anything because of the potential for harm to both us and the cats.

I think we had such a bad flea season because we had a lot of rain before it started getting hot (I'm in NY). On top of that, our landlord REFUSED to cut the lawn until it was over 4 feet high (he lives here, you would think he would want the place to look decent! AND he keeps the lawnmower locked up, so no one else could mow! What a slumlord, huh? )

Thanks again, everyone!!!!!