I am actively bridging concepts from GTD with works from other thoughts leaders. Franklin-Covey is certainly a popular work that gets much attention in this forum and I have posted my opinions in their respective places as I've gained much from FC, too.
I am interested in leading a thread of conversation with people who feel they benefit much from David Allen's work and at the same time, appreciate integrating what may be lesser-known paradigms into their own life. The purpose and focus of this topic is leverage GTD as a means to tie our thoughts together and pursue an affinity to fuse these works together some way, some how.
Two that come to mind right now in particular:
Mission Control -- They emphasize getting away from old school prioritization mechanisms much akin to GTD. I have not completed this work myself and discovering the relationships to GTD has perked my interest.
Landmark Education's Communication Cirriculum -- The foundation of this work stems from inventing a new model for communication for yourself. I've completed this work and just for the record, my reference to GTD came from someone I completed this Cirriculum with and believe me, I am forever thankful!
If anyone has completed either of these 2 works, I'd love to hear your thoughts. While I'm certain there are more than these 2 worth noting, I thought this would be a place to start and get the ball rolling. Please feel welcome to suggest other pieces of work that position themselves to address "personal productivity" (I try to use this term loosely) in the spirit of making this conversation multi-faceted.
This is certainly an opportunity to bring forth what you're passionate about and make it fun!
Yours truly is personally looking forward to an opportunity to see David Allen live as early as tomorrow!