Jaiku
Jaiku is a Finnish software that makes conversing with people easy. It’s an advanced form of chatroom and I love it. It works on the same principle as twitter with the added bonus of having feed reading and integration as a bonus. If I’m going out for the day but I want people to know where I am at any given point in time I can send messages to twitter because it’s the price of a local phone call rather than international, as with Jaiku where the message is sent to Finland.