Myxer, which allows users to create, share and download mobile content free of charge, has racked up 3 million users; up from 1 million in April.

Some 7 million pieces of mobile content are downloaded each month.

In addition to allowing users to send files from their computers to mobile phones, Myxer sports 150,000 ringtones, wallpapers and videos — some of which is branded content.
The ad-supported site sends files to users' phones via SMS. It also boasts the "world's largest collection of indie music ringtones."
The site also functions as a mobile content marketplace. Though most content is free, there are also pay-for premium downloads, and people who create mobile content, like ringtones and wallpapers, can sell it on Myxer.

Carrier decks have long sold mobile content at extravagant prices to its customers. Even iTunes is in on the game, selling ringtones for $2 each — double the price of buying a song on the site!