There are heaps of ways to learn new things on the 'net.
One of them is to find podcasts - and once again, there are heaps of them!
Two that I would really recommend are:
tutorials and reviews and a daily critique! brilliant stuff...
and the second:
Excellent podcasts going from raw image/camera shot through the post-processing and on to the completed product.
The thing that makes this special for me is the relationship between John Arnold and 'us' as viewers - through Flickr it's possible to have some of your pix critiqued, on occasion see your work featured on a podcast - and it's a very friendly (although with robust discussion) group.
And the other place I like to visit for thoughtful commentary and inspiration/motivation is
Howard's commentary and links to other places are thought-provoking, and inspirational, and have a great spread of topics. He posts almost daily, so always something new to read.
Having said all this, and after reading/watching - there is nothing like actually grabbing the camera and taking some shots and putting them up for discussion and critique (critique that provides solutions, not just points out the problems!). To help the reviewers it does help to give some idea of what you are trying to achieve or communicate in your shot - sometimes I forget this!