For those of you with a Canon dSLR, I really recommend, if you buy just one thing with your camera, the Canon 50mm f/1.8 - Canon Normal EF 50mm f/1.8 II Autofocus Lens 2514A002 B&H Photo Typically right around $100, but you can sometimes find them used for $50-$75. The f/1.8 will make a really big different in your photos.
(I am photographer, btw. I use the slightly more expensive version of that lens nearly all the time. You can see some of my work here - Amy Brown Photography )