In the chat room the other day I called them "Leave Me the Hell Alones"
They're like doggie crack -- very addictive and will keep them occupied for awhile if you need to get something done. Stewie loves them and I believe they helped him get a few of his stubborn baby teeth out.
I too would caution that they need to be given Greenies under supervision; it says it right on the package. Dogs that are known to be "gulpers" should not have them. Stewie just happily chews on them. I throw them away when there's about an inch left so he isn't tempted to swallow it.