How to convert and edit video among popular video formats on Mac and Windows

I am a super fan of iPhone but I am not tolerable to buy ringtones on iTunes. Fortunatly, my bosom friend, who is also a fan of iPhone, shares with me a marvellous iPhone Ringtone Maker. From now on, I am able to make ringtone using my own favorite songs from located resourse. I would like to share it with you and I am quite sure that it can give you a hand.
iPhone Ringtone Maker for Mac//iPhone Ringtone Converter//iPhone Ringtone Creator//M4R Converter