I've created a website and youtube channel called howtodigitalpaint dedicated to educating people on basic as well as advanced aspects of the digital painting process.
You can find it http://www.howtodigitalpaint.com and the youtube channel here (http://www.youtube.com/user/digimediatutorials) .
I use Photoshop as my digital painting tool of choice but there is useful info that can be translated into other programs and mediums.
If you check it let me know what you think. Thanks.