cheat sheets.

cache_fu:
  git://github.com/defunkt/cache_fu.git
  == cache_fu
  A rewrite of acts_as_cached.
  - You can no longer set a 'ttl' method on a class.  Instead, pass :ttl to
  acts_as_cached:
    >> acts_as_cached :ttl => 15.minutes
  - The is_cached? method is aliased as cached?
  - set_cache on an instance can take a ttl
    >> @story.set_cache(15.days)