Some common commands I still haven't committed to muscle memory

Mongo_Shell_crib_sheet.js

// Note: more here: http://www.mongodb.org/display/DOCS/dbshell+Reference
// also, scripting note: db = db.getSisterDB( "users" ) is a script equiv of use users in the shell

// get rs status
rs.status()

// re-configure replicaset
config = rs.conf()
//manipulate the config data here
rs.reconfigure(config);

// drop a collection
db.collectionName.drop()

// drop a database
db.dropDatabase()