It's all the rage to be using non-sql-based storage software these days. Memcache is great for caching, but what happens when it falls out of cache? Enter Tokyo Tyrant / MemcacheDB.
Sometimes all you really do need is key-value pairs. Is Tokyo Tyrant the answer? Looks like it's being used under heavy load for a few other production sites. Though MemcacheDB is purportedly being used by Digg.
There's interestingly very little online that I've found about MemcacheDB vs Tokyo Tyrant. Anyone have some info to share?