After the introduction to AVR you must have been doing good with this powerful controller. As you move further you will find fuses to be very useful to play with. And their proper and intelligent usage what makes your program best of all.
Following is the link to a very comprehensive fuse bits calculator, which takes all your inputs through drop-down menus and list. And finally generates the fuse bits and voila you are ready to go.
Website Link: Online AVR Fuse Bit Calculator