What type of camera do you use?
I'm new to the photography game and my introductory camera is the Sony Alpha 200 and love it.
I've been shooting in earnest for the past 3 years. Previously it was back in University and High School and school darkrooms.
I shoot with a Canon 50D. Lenses are 17-55 2.8IS, 17-85 4-5.6IS, 100-400L, 70-200 2.8IS, 2x teleconverter
The 50D has much faster tracking on AF than the base model XSi, T1i etc... It also has great response at high ISO. These features make it and my lenses of choice great for shooting indoor Judo and outdoor birds and other animals.