Have a month or two to do nothing but click on links on a website? Visit Fan Graphs. You’ll find stats here, but you’ll also find 70 charts for every player tracking daily and seasonal trends. Most immediately interesting to me were the daily graphs tracking AVG, OBP, SLG, K/9, BB/9, and on and on. Stats are compared to a ML average, so you can visually judge relative improvement or decline. Plus righty/lefty and home/away splits are also graphed. Simply awesome.