audioBoo is a free app that allows you to easily record, tag and instantly share audio. You can record from your desktop, by using the app on a smartphone or by uploading as an audio file. There’s a 3 minute limit for the free plan, but you can upgrade for more. You can share your boos with Twitter and Facebook or embed in blog posts or your website.
audioBoo Channels
Audioboo also has a selection of channels you can listen to that are well worth exploring. These include audiobooks and blogs, as well as categories such as the BBC, Business, Charity, Community, Culture, Entertainment, News, Radio and Sport. Some examples include Brian Blessed, Bletchley Park and the Guardian. Follow @AudioBoo on Twitter to get updates on recommended boos.
A video introduction to audioBoo
Intro to Audioboo from Mark Rock on Vimeo.
Sue Beckingham
Social Media for Learning 
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rest of the site is really good.