There is no shortage of information on the web about #productivity.  Here is but a few of them, mostly tailored toward workplace productivity but with a few other mixed in for variety!  As with the other lists, it is a work in progress so stay tuned for updates.

Dumb little man
Zen habits
Getting Things Done (Experiences of)
The Productivity Pro
Michael Hyatt
A life of productivity
Did I Get Things Done
All Things Workplace
43 Folders
Simple productivity blog
Technotheory
Scott Young
GTD Times
Personal Development self help
Productivity 501
The fast track
Time management ninja
Work awesome
Alpha Efficiency
Lateral action
Ian’s Messy desk
Productive Flourishing
Tablet Productive
Neen James
Business Productivity
High Performance Blog
The Practicing IT Project Manager (Weekly round up  of PM articles)
Captain time
Tara Robinson
Time Doctor
Two minute rule
Flipping Heck
Make it snappy show
Stop Start Do
Paul Minorsv
Jeff Sanders
Self Development Secrets