Anyone interested in this idea of posting page images first, and then gradually tracking the proofreading, may want to check out Project Runeberg. They have been using a process similar to this for a while now. Andrew On Thu, 14 Jul 2005, Robert Shimmin wrote:
The Christian Classics Etherial Library, which was doing distributed proofreading even before DP, has an interesting approach to this. Rather than wait until a project is "done" before posting it do their site, they post the scans and raw OCR the day they get it, and it's this live version that undergoes continuous proofreading and markup a page at a time.
My memory says they do have a way of indicating to the end user how thoroughly "done" any particular text is, but cannot recall any details at this juncture.