I will start:

* Online Grocery shopping with Automated reordering. The service provides a small RFID scanner for the trash can, and all items are tagged with a RFID. Anytime it's thrown away, the items are reordered (such as milk/eggs/drinks). Would work with your local grocery shop.

* A everything recommendations system (such as Amazon's you might also like) except spans all things (not just things to buy, but also places to go visit, people, idealogies, match making, hobbies, cars, music, etc). Data sources would include websites you buy stuff, social networks, your bank information, gps info, phone calls, browsing methods, your private data, your photos, music, everything. (heh, privacy nightmare).