Add a second vote for Montreal Steak Seasoning.
The primary ingredients in MSS are salt, black papper, and garlic. Probably what you'd want in a home made rub anyway.
If you're looking for a source for rub recipes, you might take a look at Sauces, Rubs, and Marinades, Bastes, Butters, and Glazes by Steven Raichlen. Your library probably has a copy, or about $10 at Amazon. Raichlen's Basic Rub is my go-to choice for pork ribs. And I'm betting that he has a pretty good beef rub, too.