Tired of paying for ringtones....Yeah who isn't. Well there are number of free ringtone sites on the net that offer all kinds of goodies in various formats for various phones. You can also turn any mp3 or audio clip into a ringtone as well. Imagine the possiblities there ;)
Fun for Mobile
SmashtheTones is a little more flexible. It supports more phones, including Sprint and Verizon phones, as well as other smaller carriers around the world, and It lets you use your own music and photos, rather than a predefined selection.