I know we're all interested in this. I know *I* am always looking for new ways to improve my photography. I've been a member of our local chapter of PPA for 7 years, I've attended many conferences and seminars. I've paid a lot to learn more about photography.
And through it all, I think PhotoVision is one of the best values on the market for those wanting to improve their photography. It is a subscription to a set of DVDs (you get 6 during the year). Each DVD is filled with 3 hours worth of information from various speakers on various topics. These are real professionals sharing their secrets. The cost is normally $199, but if you use coupon code PVFAN you get the entire set for just $49.
http://www.photovision2011.com/
I've been with PhotoVision for several years now. I think this is only the 2nd time that they have discounted the sets this much. It's a good deal at full price (especially compared to the cost of the seminars I have attended). But it's a heckuva deal at just $49.