In my hobby work on house information/house automation for our house I needed somewhere to store all the most recent data collected from various sensors and systems, in such a way that it would be accessible from any computer on our extended network. And I chose to use Memcached - as it is running purely in memory, and by its very nature is fast and accessible over the network.

It's data is not persistent after a crash - but I had no need for this, as I collect data very frequently, and persistence was not needed.

Here is a recent output from a dump of data stored in memcached :

I can now access this data from any computer on the network - useful for distributed display purposes,

The first 6 variables have been picked up from a weatherstation - which displays it's data as a webpage. I wrote a Ruby script to scrape the data off this webpage, to make it possible to generate new displays and to be used by other services..

The 4 last variables have been collected from 3 Jeenodes around the house, and currently represent temperature reading, and the last time movement was detected by the movement sensor of Jeenode ID 36.