DownloadCoin enabled you to upload any file under 100MB and specify a price that people must pay to access the file. The user was redirected to the download within seconds of payment being sent, and they can opt to have a link to the file sent via email as well.
No registration was required, just input your Bitcoin address along with a price and then upload the file. You were also set the price in USD and it will dynamically alter the Bitcoin amount based on the exchange rate within the last few hours.
When your account balance reached 0.01 BTC it was automatically withdrawn to the address specified minus a 1% transaction fee.
The service is no longer operational.