SoundCloud is sort of a YouTube for audio, making it easy for anyone to record, upload, and share music, spoken word, or other audio with the world. Once your file is online, you can share the link with anyone or embed an audio widget on a web site.
SoundCloud also offers a mobile app for the iPhone which lets you search for audio from other users or listen to audio files that have been shared with you. Today the company released SoundCloud 1.5 for the iPhone, iPod touch and iPad, which adds support for recording audio from a mobile device.
That means you can record your band practice, a voice memo, or just about anything else, and upload it to the SoundCloud web site as soon as you hit the save button. You can set tracks as public or private, and you can share any public track with Facebook or Twitter with a click of the button.
SoundCloud is available as a free download from the App Store. With a free account there are limits on how much audio you can upload, how many people you can share tracks with, and how many times they can be downloaded, but SoundCloud also offers paid accounts with additional features.