SatoshiDice is a spark which is driving interest from the entire gambling industry into Bitcoin. Certainly it puts stress on the system, but a system that's used is a system that's stressed, and the Bitcoin economy is far healthier for it.
I'm 100% positive that the value of my bitcoins has gone up because of SD's success and interest from the gambling industry that has come from that. So you've made myself, and everyone else who has bitcoins, money. And you've helped us to understand issues that need to be dealt with in the protocol. Thank you for that.