persistant data

[Randy Wigginton]

Actually we're using memcache in a reliable configuration.  There are  
some implementation details; we always have a backup memcache  
server.  If we have problems with the first server, or the data is  
not present, we use a backup server.  Also, there is a separate  
process that keeps data in the memcache synchronized with our  
database.  This probably isn't for most people, but for our purposes  
it is perfect.