I think its a great idea... for some one else. As mentioned above I often go back over my entire work as I write it, I can think of one time when i mentioned in early chapter "such a thing is impossible" and then in a late chapter say "sure I do such a thing all the time" I did not catch that till a re-read through because too much calendar time had passed between writing those lines.
So sounds like fun... just dont think I would take part. I would read the posts there assuming some one with talent was writing there.