There are numerous web resources available to learn about lighting. If you can be a bit more descriptive in what you'd like to light, we can help you. If you photograph people or still life scenes, I can help you. If you shoot nature or macro, others here can help you.
One of the best resources I have is
www.photo.net Go to the list of "All Forums", then pick the "Lighting" forum. That's a good start. Thousands of posts and replies.
www.photoflex.com is another good resource.
www.zuga.net has a link to zuga tv. which allows you to watch professionals at work and how they set up lighting for their clients (you'll need DSL, though. The zuga.net forum has some excellent photographers contributing on a daily basis, and they really like to help people out if they are serious about photography.
A great lighting book is "The Lighting Cookbook". I can't remember the author, but I have the book around here somewhere. It was written from a film based point of view, but it's equally applicable to digital photography. I also have "The Business Of Portrait Photography" by Tom McDonald, and I consider it to be an excellent resource for lighting people.
Lighting is the key to excellent photography regardless of what you are shooting, and it's a great foundation to build you skills on. It's also probably the hardest thing to learn - it takes a ton of practice and experimentation.
When you start asking questions about lighting, you also start getting into expensive equipement options. Let us know what you want to do, then we can spit out ideas on cheap, home made alternatives for you that still produce professional results.