In the ColdFusion 8 Web Application Construction Kit Volume 2: Application Development, I had the honor of doing the chapter on the CF8 debugger. If I do say so myself, I think that it's a really complete introduction both to installing, configuring, and using the debugger, along with many tips, tricks, and traps--perhaps even a better one-stop resource than the docs themselves.
Best of all, it's one of the chapters that's been made available online. There was fear that Volume 2 would be too big and so a few chapters (mostly on older topics) were put into a 550 page PDF. My chapter is near the back of this PDF.
Also, note that if you have the print version of the book, it's technically chapter 52 of volume 2, but you won't see these online chapters listed in its table of contents. Instead, they appear in the TOC at the start of vol 3 (long story)
Sadly, I couldn't get permission to just cut out this one chapter, so you do need to get the full PDF. You should be able to easily jump to the starting page (using Ctrl-Shift-n), which is page 467 in the PDF, despite the table of contents on the first page which lists it at 471. And of course, you can print just selected pages from a PDF as well.
Either way, I hope you get great value out of the information offered. I'd really welcome your feedback.
(PS I mentioned last week that I'd also done an article on the CF8 debugger in the FusionAuthority Quarterly Update, in their recent CF8 Special Edition. Unfortunately, the FAQU articles are not available online.)