The other day i was chatting with my team mate Shk.Aziz Poonawalla and he inspired me to do a plugin for coppermine which should convert the uploaded documents (txt, pdf, doc, ppt etc..) to Scribd iPaper format and then display them using the Scribd document viewer.
So i went ahead and created such a plugin for coppermine. The plugin requires PHP 5 and CURL on the server and you should register an account on Scribd Platform to get an API key and secret phrase. After installing the plugin whenever a document is uploaded to cpg - it is copied (uploaded) to scribd server as well (behind the scenes). Scribd converts the document to iPaper format on its server and assigns a document id to it. Now when the document is viewed in cpg, we display the Scribd document viewer and supply it the document id. This displays the document in a nice flash viewer.
For further instructions and to download the plugin please see the forum thread.