Adobe released a beta of a new service that they're calling Share today. Share allows you to easily share documents with other people. A Flex based UI allows you to upload and and manage your files (Adobe gives you 1 GB of space). Once you've uploaded them, you can easily share them with others by emailing them a link or embedding the document into a website. Documents, including PDF documents, are converted to Flash files before being shown to the user.
Here is the UI for the application:

And one more screenshot...

TechCrunch has a little more on Share and the Buzzword acquisition. Other than that, there's not a lot more information about it. Its probably best to head over and try the application yourself.
Comments
Flex error
I get an IOerror when trying to see the document you have shared.
[RPC Fault faultString="HTTP request error" faultCode="Server.Error.Request" faultDetail="Error: [IOErrorEvent type="ioError" bubbles=false cancelable=false eventPhase=2 text="Error #2032: Stream Error. URL: https://share.adobe.com/adc/flash?nodeId=40251e7d-6ee6-11dc-b75f-151d3f6d9313"]. URL: https://share.adobe.com/adc/flash?nodeId=40251e7d-6ee6-11dc-b75f-151d3f6d9313"]
at mx.rpc::AbstractInvoker/http://www.adobe.com/2006/flex/mx/internal::faultHandler()
at mx.rpc::Responder/fault()
at mx.rpc::AsyncRequest/fault()
at DirectHTTPMessageResponder/errorHandler()
at flash.events::EventDispatcher/dispatchEventFunction()
at flash.events::EventDispatcher/dispatchEvent()
at flash.net::URLLoader/redirectEvent()
me too
Document fails to load...