Autodesk Discussion Forums now have a place specifically for Dynamic Blocks... there is a note in the intro thread saying that this will eventually be combined back into the 2006 forums. http://discussion.autodesk.com/forum.jspa?forumID=154
I like the way that AUGI has set up their AutoCAD community (and not just because I helped) with only the newest version having their own general forum, then having sub-forums for major features, such as sheet sets, dynamic blocks, the cui, tables, etc.
Check out this blog: http://mdouglas.blogs.com/in_the_dynamic_interface/
Also, there was a free course given (ATP augi training program) in June on Dyn blocks... you can download the course material here if you are a member: http://augi.com/education/archive.asp?page=293
ATP076 Dynamic Blocks and Block Enhancements - from customization guru Lee Ambrosius.
I recommend that you check out his website http://www.hyperpics.com/, which is home to loads of valuable information.
Here's a link to a nice tutorial from Ellen Finkelstein... http://www.ellenfinkelstein.com/
link to dynamic block whitepapers from Autodesk http://usa.autodesk.com/adsk/servlet/item?siteID=123112&id=5543837
My secretary was telling me this morning of a guy (Paul Harris) she heard on KMOX radio, I did poke around and read some of his stuff which was pretty entertaining, this was amusing to me, offering up ideas for new reality shows.
http://www.harrisonline.com/plain/2003/03/ultimate-reality-show-contest.html this is hilarious... I vote for Miss Personality...