The memcache was purely the result of polling the server every second to keep different JS clients in sync. Admittedly it's not very elegant, but it was something I did just to see how easy it is (backbone makes this really really easy).
Unfortunately you pay for every datastore query, and when 50 odd people have the order page up, each polling every second, thing get a little silly. Additionally with appengine memcache is just one import away.
Unfortunately you pay for every datastore query, and when 50 odd people have the order page up, each polling every second, thing get a little silly. Additionally with appengine memcache is just one import away.