As part of our "Centaur" planning, please fill in the ColdFusion 8 Features Used survey and the ColdFusion Platform And Vendors survey. And the more respondents the better, so forward these URLs to every CF developer you know.
Microsoft Excel is a fact of life for many business, and ColdFusion Excel integration (both how to generate Excel spreadsheets programmatically, and how to read and manipulate them) is a rather frequent query. Charlie Arehart has posted a detailed list of all of the ColdFusion Excel integration options, complete with descriptions and links and more.
Oh, and incidentally, this is also covered in Chapter 76 of CFWACK Volume 3.