One of the resources that I have absolutely loved and spent way too much time playing with is called Stellarium. It is a free planetarium for your computer. It shows you a realistic view of the sky - at any time of the day, year or location. It will show you the constellations from 12 different cultures, nebulae, open clusters, close ups of the planets. The stars even twinkle! It's pretty darn fun to play with. I would recommend it to anyone who enjoys the night sky. It will certainly help you figure out what's up there, making your actual night sky observations more enjoyable.
The night sky showing the location of a couple of planets and the incredible Milky Way.
And there's Jupiter with a shooting star near it! Can you find Orion?
A cool view with Constellation Art turned on. (Oh, so that's what it looks like!)
Wanna see what the sky looks like from Mars? There you go!
Of course, not all of us have skies as clear as is shown in the program. So you can change the amount of light pollution to see how it affects your view of the night sky. Let's all try to unpollute the night sky.