Flea infestation

Question
What is the best and safest way to de-flea my cats?  Are there any OTC medications which last longer than 30 days?

Answer
The BEST thing is Advantage Flea Drops.  Be careful about over the counter flea medicines.  Read the labels VERY carefully because many of them say that they last 30 days, but that does not mean that it kills fleas for 30 days. You cannot use many DOG flea drops for cats.