I'll echo Larry's sentiments to go clipless.
It may seem daunting at first because there are so many different options when it comes to clipless pedals, from shoes, to pedals, to style of pedal, to different models of pedals, different release angles, float, etc. You can narrow it pretty quickly though--as Larry said, you'll probably want mountain clipless. They have a recessed cleat, so they're more comfortable to walk in since they're designed to be walked in on trails walking or what-have-you. That instantly rules out half the pedals on the market.
The major three clipless MTB pedal systems are: Time ATAC, Shimano SPD style, and Crankbrothers Eggbeaters. There are others, but these are the most common and the most economical. You may want to check out Nashbar or Performance; they commonly have some SPD-style clipless pedals and shoes comboed for cheap, and they're usually of decent quality.
Once you start riding clipless, you'll probably find it hard to go back to regular platform pedals...the only competition for clipless pedals are a pair of well-adjusted clip/strap set ups, and to really get the benefit of clips and straps, you need to tighten them every time you put them on. Additionally, good clip/straps set ups are considerably heavier than clipless pedals.