I also really miss how in IRC channels are kinda the default way of communicating. I feel like Skype and others start from one-to-one communication and channels/rooms/... are more like a secondary feature.
If at work I need to ask some question, I do not care who answers to that and in many cases I do not know who has the answer. I do know what team or interest group might know the answer. With channel first kind of IM (IRC) I just join #folks-who-develop-the-server-im-sending-data-to and throw the question in the air. Eventually someone answers me.
With Skype, there is no such channel, because the mindset is different. So I need to browser the corporate intranet to figure out who might be the tech lead of the server I'm sending data to and contact that person. I chose the tech lead because he's the person who most probably knows the answer. Too bad that he is also the busiest one and I'm just making the situation worse.
Also, I really miss news groups. Why each web forum must reinvent the wheel and fail at it? :( I'm not that old, only 31. But boy where things better when I was younger. :D