cheat sheets.

Quick Reference for Db related tasks in Rails 3.0.0rc (as of 2010-08-25)

For textual description:
  `cheat rails_rake_tasks`
  `rake -T` (even better - not obsolete) 

task db:migrate:reset => ["db:drop", "db:create", "db:migrate"]
task db:reset => [ 'db:drop', 'db:setup' ]
task db:setup => [ 'db:create', 'db:schema:load', 'db:seed' ]