If you've spent even 5 minutes skimming gtd.alltop.com, you'll probably understand why I've been thinking about the connection between organizational ability and productivity. Honestly, blogs on productivity are notorious in that they're generally more about how to organize and track your tasks than how to be more efficient.
Productivity is a measure of work accomplished - the amount 1 person can do in their 8 hour work day. This may be measured by units assembled, lawns mowed, or more recently, emails per hour. The connection between the amount of work an individual can accomplish and their organizational ability is tenuous - some people may require a high degree of organization to complete their tasks, others won't. What I was really looking for, but didn't find, was a blog on how to handle more information, more tasks, more email, and be more productive. Maybe there are components of the different GTD blogs that touch on true productivity, but for people that aren't organized, maybe there's something more out there. Just a thought.