there's quite a wealth of tutorials and helpful advice to be found over at conceptart.org's forums, but a guy who goes by Prometheus has been steadily cobbling together a fantastic tutorial that puts together all the basic and 'little things' into one short document that everyone can benefit from.
i don't know anyone who doesn't have at least some fairly serious holes in their classical education, this can help caulk them up a bit
it's quick and informal, but there's a lot of information here.
http://itchstudios.com/psg/art_tut.htm
Replies
http://www.conceptart.org/forums/showthread.php?t=10969&page=1
((RRggggghh! Stuck @ work and can't paint! Rrrrgghhh!))
/jzero
Definitely an improvement on me