No, I have used a lot of different resources. The CLEP Official Study Guide and the Princeton Review book have been great for the CLEP exams that they cover. The Cliffs Quick Review: Economics was good, but maybe a little weak on some of the Microeconomics topics (certainly enough to pass, though). Be wary of the finishcollegefast.com materials -- the Management Information Systems document seemed pretty good (I only had time to read about half of it, but I have been working in the field for about 20 years), but the Principles of Supervision document was a mess -- bad spelling and grammar, wrong on some details, not at all comprehensive.

I used an online version of Statistics Demystified from the Excelsior College Virtual Library, and it was helpful. It's an easy read, and gets you through the material quickly, but it's weak on the advanced topics, and had me sweating through the exam. I managed to score an A anyway, but I didn't do well in experiment design and hypothesis areas.

Buying the ECE practice exams for Ethics and reading through the discussions of all the answers was enough to get me through that exam. CLEP Sociology needed no prep at all.

I'm sure there's more to say, but I'm still prepping!