Thanks very much to Rey Bango for the excellent, easy BlogCFC instructions, and to Dan Zarella for the javascript that makes it go.

The post with full 'how to' is here, on Rey's site:
http://www.reybango.com/index.cfm/2009/1/20/Adding-TweetBacks-to-BlogCFC

I just love the cf community... and twitter!

== == ==

UPDATE:

The new improved version is here:
http://www.reybango.com/index.cfm/2009/1/23/TweetBacks--BlogCFC--A-BIG-Update-Major-Speed-Improvement

Thanks also to Adam Tuttle for the cool sweettweets cfc!