If you are really excited by the photographs created using HDR, then the best place to learn about all the possibilities for HDR is to look at the website Stuck in Customs
Trey Ratcliff has a great life. He spends most of his time travelling the world, taking HDR photos and talking about his work. Fortunate enough to make himself 'financially independent', he now has the life of a permanant travel phohographer.
On the web site you will find a great tutorial on taking and using HDR photographs. Tens, if not hundred of thousands of poeple have looked at his course.
You may also like to read about his views on the next type of cameras that will replace Digital SLR's in 3rd generation future