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When starting up an Ubuntu computer, for some odd reason it decides to give away all the user logins that are available on that machine. This isn't particularly secure. Yes, these details can be obtained by directly reading the hard drive, but this is significant effort compared to simply turning it on.

To disable the user list, there doesn't seem to be a user interface switch as of Ubuntu 10.04, but there is a command line way to do it.

Torchat is an anonymous instant messenger client running atop the Tor network. It niftily uses hidden services to build connections over the network which are end to end encrypted, and where both parties are hidden from each other.

By default, it comes packaged ready to go with its own Tor client. This is fine if you're travelling around with your encrypted USB stick or the like, but not very useful if you're already running a Tor client.