If you're like me the very first thing that you buy is a screen protector. I put on a screen protector before I even start playing with my new toy. If your gadget has a screen its probably the most fragile and delicate part of the device. The screen also gets touched a lot and is really good at collecting fingerprints. These reasons a lot make the screen protector the most important item I can buy for my new device. I don't want to be staring at fingerprints and scratches every time that I look at it.
No matter how well you take care of your device it's still going to see a good amount of wear and tear. The only way to avoid this is to purchase a screen protector and a case. They even make full body screen protectors which lets you purchase just one item instead of two. Read more about the Droid Eris screen protector, the HTC Evo 4g screen protector and the iPad screen protector so that you can properly protect your new device.
The next most important accessory is probably the car charger. Many people now-a-days use their phone to do everything so you don't want to be left with a dead cell phone battery. Being able to charge your phone during a car ride can make a huge difference in battery life.
Regardless of which accessory you buy, just make sure you get the most out of your device!
What's your must have accessory?