It's time to retire the mom test
One of the more humorous ad series today is the Geico "caveman" commercials, featuring a caveman complaining about the stereotype of something being "so easy a caveman could do it." Since we don't have to worry about offending cavemen (or cavewomen), companies can safely poke humor at that demographic group and not worry about alienating anyone. However, you might want to think twice about saying "it's so easy your mom can do it."
I've thought about this several times recently, after attending a talk at LinuxWorld Expo where someone said the concept of the workspace on Linux needed to be dumbed down for "single moms," and once again when computer shopping with my partner after the salesperson commented that she had brought a geek with her -- as if she weren't capable of being geeky on her own.