More and more ready-made blends are available on the shelf: Thai, Jerk, Cajun. Most of their ingredients are probably in your pantry already, why not just buy what you need?
For lots of blend recipes, see JoycesFineCooking.Com, OnlineCookbook.com, ButterBuds.com, DrMirkun.com.
And Paula Deen's house blend? 1 cup kosher salt, 1/2 cup black pepper, 1/4 cup garlic powder.