RDS Database Stats
If you use Amazon RDS the following might be useful for pulling some simple Min, Max stats (FreeStorageSpace, CPU Utilisation and DB Connection Count) about your RDS instance
git clone http://github.com/wal/RDS-DB-Stats.git
cd RDS-DB-Stats
ruby rds_db_stats.rb AWS_ACCESS_KEY AWS_SECRET_KEY RDS_ID TIME
RDS_ID - your rds instance identifier
TIME - the number of minutes you want to calculate the stats for
(i.e 60 = last hour)
Code is on Github