Yahoo, Google to weld instant messaging features
So far, exactly what that means is anyone’s guess. But the IM market could certainly benefit from a little more interoperability. Despite the fact that IM use is on the rise among home users and businesses alike, each separate IM network remains a walled garden, independent of all the others. Getting them to work together — similar to how e-mail works — would benefit everyone.
There are a number of IM clients available that can connect to multiple networks at the same time, including Adium, Pidgin, and Trillian. But these clients still require you to have your own account on each network in order to talk to other people on that network. What would be better would be the ability to talk to anyone on any network from a single account.