I recently acquired a Dragon Rider 500 as a birthday gift. This is an excellent product I think really completes the AVR Dragon as far as functionality.
I have just finished an Instructable on the assembly of the kit. Which is the first of a couple I intend to do. Here's a link for those interested:
-How to Assemble the Dragon Rider 500:
-How to Use the Dragon Rider 500:
-Off-board ISP with the Dragon Rider 500
In the Early Stages
Check back for updates. A big thanks to GrahamDavies of Ecros Technology for sending me the LCD Add-on and Ribbon Cable Add-on with his compliments. These are now part of the assembly tutorial.