I’ve been using the chat client Digsby for a while now, and it’s pretty awesome. It’s comparatively new (less than a year), but quite stable, feature complete, and adds a bunch of new features that simplify things substantially.
Given the proliferation of social networks and messaging networks, it’s quite nice to have one tool that bridges them. I don’t have to deal with the fact that not everyone uses the same tools – Digsby gives me a list of everyone, and when I want to talk with them, it just works.
I love tools that hide complexity without being simplistic.