Skype is great! There are few voip services that perform as well as Skype. The price also cannot be beaten. The option to run two chat sessions with different user IDs is a need for some people who maybe want to have their work skype account active as well as their personal account.
This method will allow you to do just that. It will avoid the need for you to close your skype account and re-login with another account to avoid mixing personal and business together.