You'll just want to periodically check the pads for wear... either by making note of increased lever travel or by checking the brake pad spacing / wear at the rotor. When adjusting for wear, be sure to adjust both the inner (fixed) and outer (actuating) pads. If you forget or are a bit late-to-need on adjusting the inner pad you may hear a metallic sound when you apply the brake: this is the rotor brushing up against the caliper body.

That's about it. We have a couple thousand miles on our Avid's original pads, a few of which were some pretty hard braking from mountain rides in North Georgia, North Carolina and Eastern Tennessee. I have a spare set of pads on hand, but so far so good.