I fall into the former group, as I carry my BlackBerry mostly naked in a jeans or jacket pocket, and I don't use a holster or other case for protection. That means my device often mixes it up with keys and lighters and other potential damaging knickknacks. If I didn't use a screen protector, my BlackBerry display would look like a skating rink after an NHL playoff game.

I prefer BodyGuardz's screen protectors, since I've had very good luck with the brand. In fact, I've been using the same BodyGuardz screen protector for almost six months, and it's barely showing its age. However, BodyGuardz aren't exactly cheap. You can buy for $20 on Amazon, or you can pick up two .

Screen and device protection from other companies, , are a bit more affordable at $12 or less on Amazon. And you can even pick up .

Memory cards are essential if you want to use your BlackBerry for listening to music or viewing video; the miniscule amount of storage space built into your BlackBerry's internal memory makes it less-than-ideal for keeping and consuming multimedia.