Just a note that i took my ColdFusion 7 Certification friday at 4:00 PM. Well, got an 88%!! The studying payed off. My only material for studying was Ben Forta's Macromedia ColdFusion MX7 Certified Developer Study Guide which is a great study aid. However, the best tool is actually using ColdFusion in you daily work.
I can now upgrade my certification, Hooray!!