The Steam client has been updated and the chat interface is much much better. What I really like is that you can see your friends in the friends list by game. I was doing this manually before; because it was awesome to see a list of 5-10 people for the games that we both have. It made it easy to find people to play CSGO or Civilization 5 with.
It even works on the web too, no need to download a client to chat with people on Steam!