Example Usage:

$ ( umask 066 && touch my.creds )
$ cat > my.creds <<EOF 
AWSAccessKeyId=1234567890ABCDEFGHIJ
AWSSecretKey=123456789+8abcdefghijklmjo/tuvwxyzABCDEF
EOF
$ export AWS_CREDENTIAL_FILE=$PWD/my.creds

$ rds-describe-db-engine-versions
VERSION  mysql       5.1.45       mysql5.1         MySQL Community Edition               Mysql 5.1.45
VERSION  mysql       5.1.49       mysql5.1         MySQL Community Edition               MySQL 5.1.49-R1 with innodb plugin
...


$ rds-create-db-instance \
   --db-instance-class db.m1.small --engine mysql --allocated-storage 5 \
   --master-username  smmaster --master-user-password  foobarabc \
   --db-instance-identifier sm-tester-01
DBINSTANCE  sm-tester-01  db.m1.small  mysql  5  smmaster  creating  1  ****  n  5.1.57  general-public-license
      SECGROUP  default  active
      PARAMGRP  default.mysql5.1  in-sync

$ rds-describe-db-instances 
DBINSTANCE  sm-tester-01  db.m1.small  mysql  5  smmaster  creating  us-east-1c  1  ****  n  5.1.57  general-public-license
      SECGROUP  default  active
      PARAMGRP  default.mysql5.1  in-sync

# wait until describe-db-instances shows 'available' rather than 'creating'
# this can take several minutes

$ rds-create-db-snapshot  --db-snapshot-identifier foobar \
   --db-instance-identifier sm-tester-01
DBSNAPSHOT  foobar  sm-tester-01  2011-06-15T20:56:42.887Z  mysql  5  creating  smmaster  5.1.57  general-public-license

$ rds-describe-db-snapshots  --db-snapshot-identifier foobar  
DBSNAPSHOT  foobar  2011-06-15T20:58:45.669Z  sm-tester-01  2011-06-15T20:56:42.887Z  mysql  5  available  smmaster  5.1.57  general-public-license

# wait for snapshot to go to 'available' state, from 'creating'

$ rds-delete-db-snapshot  --force --db-snapshot-identifier foobar  
DBSNAPSHOT  foobar  2011-06-15T20:58:45.669Z  sm-tester-01  2011-06-15T20:56:42.887Z  mysql  5  deleted  smmaster  5.1.57  general-public-license


$ rds-delete-db-instance --force --db-instance-identifier sm-tester-01 \
    --skip-final-snapshot
DBINSTANCE  sm-tester-01  2011-06-15T20:56:42.887Z  db.m1.small  mysql  5  smmaster  deleting  sm-tester-01.cvhcfcwinf0o.us-east-1.rds.amazonaws.com  3306  us-east-1c  1  n  5.1.57  general-public-license
      SECGROUP  default  active
      PARAMGRP  default.mysql5.1  in-sync
