There's a lot of free info out there, over the years I've looked at a lot of it, and my current use still includes the following mix of Online Free/And Fee, plus Books by in particular two Authors.
Adobe TV : (Free)
Lynda.Com : (Some free, but a Fee Membership gives the best Choice of Info, very very well done and presented)
Martin Evening : any Book by this Chap on Light Room & Photoshop
Michael Freeman : Any Book by this chap on Photography, and there are quite a few, will push you in the right direction
I do look at the Free Lightroom info presented by Matt Kloskowski online, and I have a couple of his Books on Layers, this Guy is switched on.
Kelby I just cant stand to watch and listen to although his Books are, Ok, but not in the same League as Freeman or Evening, but my opinion only.
Hope this Helps and good luck with the Photography.