IM services - just services, let me use my own client
During the early days of IM dreams when ICQ was massive (despite an awful number system for users and having to add every contact again if you reinstalled) I was there, then my friends started going elsewhere so I signed up to other things to keep in contact. As a result of that I've now got accounts on ICQ, AIM, MSN / Live whatever, Yahoo, GTalk and Skype.
If it wasn't for programs like Pidgin and Trillian I'd have long since gone crazy with the need to install separate clients for maybe one or two friends. One less client might sound like an ideal way to go but I'm not happy with it being pushed to Skype as It's a horrid program. Luckily Trillian also connects to Skype. It seems very stupid to be killing the most popular service and hoping the users will all just accept it and go to Skype but then this is the same company that has just pushed out Windows 8.