Don’t forget to thank the people that wrote your letters of recommendation. These faculty members took time out of their very busy lives to write letters for you, and they deserve at least a thank you in return. Send them a thank you note, or stop by their office to say thank you in person. This not only shows that you are truly grateful for their effort, but it gives off a very good impression.
Also, stay in touch with these individuals. In the spring, let them know which schools you got in; when you go off to grad school, drop them a line every once in a while to let them know how you are doing. You might need to request their help again at some point in the future, and they are more likely to help if you have kept in touch with them.