I shoot with a lot of different bodies, however I constantly find myself resorting back to my D40 for shooting as my "go to" body. Although Nikon refers to it as their "Amateur" body, when I compare it to my D200, D7000, etc. it's hard to tell unless I'm blowing it up for print. Screen savers, print material < 24" tall, Facebook (although I never post anything on facebook in spite of how bad it compresses the photo) it's perfect.
If I were to recommend a camera to someone wanting to learn how to shoot and get away from the "Auto" function, no doubt it would be the D40. Also the other plus side is you paid very little for a great body, and still hve left over cash for some great glass to shoot with!