ColdFusion 9 was officially released on October 5th. And to get you started with ColdFusion 9, we have a host of resources to offer.
First and foremost is the ColdFusion Help and Support (H&S) page. This page is a one-stop shop for docs, videos, tutorials, blogs, featured articles, and all information related to ColdFusion.
For a quick overview of the new features of this release, see What’s New in ColdFusion 9 .
All ColdFusion 9 documentation is available online both in HTML and PDF format.
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Adobe ColdFusion 9 CFML Reference (HTML | PDF) – Read this book for descriptions, syntax, usage, and code examples for all ColdFusion tags, functions, and variables.
For the list of new tags in ColdFusion 9, see New Tags in ColdFusion 9.
For the list of new functions in ColdFusion 9, see New Functions in ColdFusion 9. -
Adobe ColdFusion 9 Language Reference (HTML) - Provides syntax and usage information for the ActionScript language elements, core libraries, and component packages and classes for ColdFusion.
The slick commenting feature lets you add and view comments to all the documentation. So, happy reading, and keep the comments coming in!

very informative and useful documents on CF9 at one place.
Thanks,
Raghuram Reddy Gottimukkula
ColdFusion Developer
Hyderabad India