10 years later, my friend Serena introduced me to IM, Instant Messenger. She was always online. We used to talk on the phone, but we found IM was easier. You see, she has 2 young children. With IM, our conversation wasn't interrupted every few minutes by "don't put that in your mouth," don't hit your brother," "yes, I'm talking to Gretchen," "put that down!" etc. It's amazing how much easier it was to understand each other without all the interruptions.
Similar good things can be said for using IM while working at the library. If you are helping a patron, you don't have to drop everything to answer the phone. Once you get back to your desk, the IM window will be flashing so that you know someone wishes to ask you something. You can also pause your conversation without the other person having to be tied to a phone until you come back. If I need to go step away from my desk, I simply type brb (be right back). The other person can continue working until I am back. Plus, I find that patrons are less willing to interrupt a phone conversation to ask a question than they are about interrupting typing.
My favorite part of IMing at work, though, is the quiet. I don't have to raise my voice to be heard by the librarian nearby. My phone conversations aren't bothering the students studying nearby. Plus, I can sometimes say more without being worried about being overheard. Of course, this only works when my co-workers are using the same IM program that I am. :-)
One other IM that I've started using that isn't supported by meebo is facebook. When you are logged in to facebook, on the bottom toolbar of the webpage, it shows you which of your friends are also logged into facebook. You can click on "online friends" and then click on your friends name. This will open a IM window in which you can converse. It works the same as other instant messengers.
Occasionally, I've used online chat session help desks. I find them more useful than email. You can get immediate help and immediate answers to your questions. You can discuss the problem without sending multiple emails back and forth. I also like online help better than a help desk person on the phone; accents aren't an issue online. Plus, I tend to get to a real person online faster than I do on the phone. This is probably because they can help multiple people at once.
Using chat sessions for reference help at our library would be neat. During library hours, a student could "chat with a librarian" from home. Other employees of the college could also use this feature without leaving their offices or being tied up on the phone. The librarian could paste links into the chat session to share their finds. It would have to be advertised well in order to be used effectively, though.