Diet Coke from McDonald's. The only soda I drink is Diet Coke, and it only tastes good to me when it's from a fountain.
Netflix. I travel a lot, and being able to take seemingly endless entertainment with me anywhere in the world via my laptop is well worth the $9/month I spend on the service.
Apple products. I own an obscene number of Apple products, and don't intend on stopping anytime soon. They are THAT good.
AT&T wireless plan, for my iPhone of course. Again, this relates back to international travel.
Finally, and I feel really guilty saying this, but, I need to have cable TV and internet at home. That said, I don't have the highest level package available, and only pay for the standard channels, plus DVR service. HBO, Starz, etc. would be wasted on me.