http://blog.heroku.com/archives/2010/7/20/nosql/
http://adam.heroku.com/past/2010/7/19/memcached_a_database/
The first talks about what he's seen as his platform has grown to
support 70,000 web applications, some at very large scale. The theme
there is "polyglot persistence."
The second talks specifically about thinking of memcached as a
database. I think it's relevant for our discussion tomorrow to think
about memcached. While Redis, memcached, Cassandra, and Riak all could
be grouped under "key-value" data structures, their bread-and-butter
use cases are definitely very differently in the first article.
Dan