I like to purchase published adventures and treat them as inspirational material, typically using about half of the material inside. While I was extremely disappointed by Keep on the Shadowfell, which I didn't use at all, I'm in the middle of running Scepter Tower of Spellgard for my group. The maps are terrible for a number of reasons, and I've had to up the level of a few encounters, but the plot elements are not bad at all.
