The video below demonstrates how Read and Write for Google app combined with vocaroo.com can not only save loads of marking time (once you get into the swing of it) but it can also add depth and quality to the feedback.
Access the Chromestore here
Access vocaroo here
Here's another screencast I made on using vocaroo with a little more on sharing options
Audioboo.fm for assessment
More specifics about how to use Audioboo
