I have a wall full of photos at work, of which I've sold a couple of prints from (woohoo!! I got to deduct camera gear on my taxes!) and frequently get asked for tips on a bunch of stuff. The truth is, I don't know SH!T about shooting good pics, but I've shot enough of them that I get lucky once every 100 or so shutter clicks. In any case, I started reading these a long time ago, and they have short blurbs from a bunch of places on how to shoot stuff:
Ritz Camera Articles
Luminous Landscape Tutorials
Luminous Landscape 'understanding' series
There's a ton of good stuff out there on the web, but having a handy codified resource helps I think.
I'll add one piece of advice to all of that...if you have digital, shoot as often as you can, and then use that experience to refine your shots next time. Learn to read your EXIF info if you're not exactly sure what settings were used, that can be a great help.