Another trick the pros use is, when possible, shoot at your lens' sharpest aperture. For most lenses, that is about two full stops smaller than wide open (so the f-stop number you use will go higher by two stops). For example, if you had an f/2.8 lens, the sharpest apertures for that lens would be f/5.6 and f/8.
Obviously, good glass makes (those with big aperture) a big difference, if you can afford it that is, to get sharp images...duh. Next, avoid Increasing Your ISO, Even in Dim Light. I know our camera can do Noise Reduction actively but still I wouldn't recommend shots above ISO 800 to be taken.
Some pros believe they should sharpen all their shots with Adobe Photoshop or Aperture. Well, that's something I don't prefer as it's towards the extreme aspect of artificial photography. But well, be my guest to do that when necessary. Shoot in RAW please that your post processing be pleasantly possible.