Jeff Peters announced his new book on the CFTalk list today, ColdFusion Lists, Arrays, and Structures. I believe that this is one of the few books that tackle specific facets of the CFML Language, rather than the language and the server as a whole.

The book has positive reviews from ColdFusion pundits such as Hal Helms. Jeff is trying keep the cost low by not distributing on, and I'll try to help out by further broadcasting this new book here.

Read an excerpt [PDF].

I once tackled this topic myself shortly after CFMX was released, which was later blogged as "MX Compatibility Summary On Structure & Sorting Usage" on CFGURU.