I know you (Not all of you) must be having multiple mail IDs for IMs i.e. for chatting. If you are one them then I am going to help you Chatting addicts by my this post.
This trick will enable you to use more than one account in any Messenger. It’s really very simple to do. A small registry hack is needed to do it. I am doing this for Yahoo messenger, you can do it for others.

• Now, open your Registry Editor (Run > type regedit) and follow path:

• Right click anywhere and select New > DWORD Value.
• Name the entry as “Plural” (Without the quotes). Double-click the newly made entry (Plural), and assign it a value 1.
• That's it just log in to yahoo messenger to check.