Looking for a road bike

I am looking for a road bike.. now that summer is going to be here for the next 4 months, I want to do some serious biking. Biking was one of those activities I seriously cherished when I was growing up. Though 4 kilometers from home to school and back cannot be considered as some serious activity, the joy I got out of it was tremendous. Thats one activity I am longing to get back to :) and am pretty sure I will relish every moment of it :). So.. if you come across a good road bike for sale, please let me know :).