For those who don't yet know what I'm talking about:
Gobby is a free collaborative editor based on libobby, a library which provides synced document buffers. It supports multiple documents in one session and a multi-user chat. It runs on Microsoft Windows, Mac OS X, Linux and other Unix-like platforms.
apt-get install gobby later, I was astounded as to how mature it already feels. I think Gobby will be of great benefit when taking notes during conferences, talks and so on. It could also prove invaluable as a pair programming tool.
Anyways, I already hear you crying "but SubEthaEdit has been doing this for ages", which is true. But:
There you have it.
(via Daniel Stone)