So I came across this article on eventual consistency on dzone and thought I'd pass it along. I comes from a Riak meetup from last month and talks about calculating what eventual consistency means on dynamo style systems. It's really quite interesting and comes with a link for a calculator. The idea is that if you switch from N=3, R=W=1 to N=2, R=2, N=1 system, how does that effect consistency and at what point in time could you reasonably expect your data to be perfectly consistent.
and a link to the calculator