An important addition for the non-local friendly administrator: CrossLoop. This is a piece of software I have long been looking for. Often I have to give computer support over the phone to friends and relatives. I have always wanted to set up a VNC or Remote Desktop connection but have feared either security or complexity issues (or both). With this tool, both problems have vanished. Just download, install and start. Let your friend tell you the security number displayed in large friendly letters and connect to his computer via an encrypted VNC channel that will find its way through NAT and firewalls.
On the the downside: It is “just” freeware (and not open source) and it is “just” VNC and not NX Server (NoMachine, FreeNX) or Remote Desktop but hey, its free its usable and its drop-dead easy to set up.