For my own purposes I have written a number of WordPress plugins.

  1. S3Copy - Makes backup copies of your pictures to an S3 Compatible server. I use sirv.com myself. It also mangles tags so files are server from the S3 bucket.
  2. wptools - A collection of WordPress related functionality.
  3. auto-content - A basic post from template plugin.
  4. simple-members-only - A fork of a defunct plugin.