You did the Iphone thing?
Good luck. I have a love hate relationship with mine.
It's an awesome piece of computerized art that works great for everything but a phone.
One App you have to get...if you are a big a geek as I am about fuel mileage and stuff is one called Gas Cubby. It costs you like five bucks but it's well worth it.
You put in all your vehicle info...oil changes, tire rotations stuff like that and then you post a note every time you fuel up. It keeps a running average of your fuel mileage plus one between each tank. As you get close to oil changes and anything else you can think of it will remind you that it's due. Plus you can export it in a .csx file and use it in a spreadsheet.