Advanced Page Expiration addresses the use cases of needing certain pages on the site to expire faster than other pages when cached in an edge cache like Varnish or Fastly. For example, all pages on the site could be cached for 24 hours except for the homepage which could be cached for five minutes.
Fasterer caching on multi-webheaded Drupal installs. This module will try to get cache items from a fast cache (probably local, like APC), then fallback to a central, consistent cache.