Below are mailing lists I watch in order to keep up to speed what's going on in the Cold Fusion community.

CF-Talk

URL/FEED: http://www.houseoffusion.com/groups/cf-talk/
Description: A great place to ask quick questions and get quick answers towards Cold Fusion

Mach-II for ColdFusion

URL/FEED: http://groups.google.com/group/mach-ii-for-coldfusion?hl=en
Description: This is a great mailing list to join if you ever want to get into understanding the Mach-II framework. You will commonly find that any related question you ask is answered by best of the Mach-II community in a very timely fashion.
NOTE: This mail list is also accessible from the main Mach-II website.

ColdSpring-Users

URL/FEED: http://groups.google.com/group/coldspring-users?hl=en
Description: If you want to know how to use ColdSpring here is good place to be. 

edmund-coldfusion

URL/FEED: http://groups.google.com/group/edmund-coldfusion?hl=en
Description: Sean Corefield's work in progress framework mailing list.

Open BlueDragon

URL/FEED: http://groups.google.com/group/openbd?hl=en
Description: If you happen to have an interest in how OpenBD is coming alive here is where to take a look. You can also use this list to express concerns and issues if you happen to be using the product.