Gamestoppers

This series of articles from Wizards of the Coast provides some good examples of complicated D&D rules in play. the series covers disrupting spells, grappling, disarming, cover, swallow whole, incorporeal monsters and level drain, beholders, and more.

Plus, it has amusing bits that sound like a real gaming group. My favorite line:

PC (Krusk): No, you didn't understand me. I wanted to disARM him, not knock his weapon out of his hand! That's a weenie tactical move, and Krusk wants nothing to do with weenie tactical moves!