[mike-cardwell]

Here are some of the more interesting apps I use. They're all free. AdFree requires root access, but the rest don't.

  AdFree        - Blocks advertising domains in /etc/hosts
  AutoGuard     - Video/audio records my car journeys in case I get in an accident
  BackTrack     - Tells you the direction and distance to a location you previously
                  saved, without using Internet access.
  K-9 Mail      - Superb IMAP client. Much better than the stock app
  APG           - PGP app, which integrates with K-9 Mail
  Kik Messenger - Like Blackberrys BBM, but works on Android/iPhone/Windows phone
  TextSecure    - Adds public key crypto to SMS storage, and also to transmission
                  if both ends are using it.
  Prey          - Will allow me to track my phone if it gets nicked.
  RedPhone      - Encrypted phone calls