Since I was looking for a way to create a simple meebo me pop-up window for my site, I scoured this forum and found two basic methods. aquaflare7 is the author of both methods:
http://forum.meebo.com/viewtopic.php?t=7329
http://forum.meebo.com/viewtopic.php?p=50033
Now, I am sure both work well, but both are two step processes that require you to either create a new html page or upload a js reference file (I am a web moron, and this is just what I gathered, so I apologize if I am wrong).
For those of you who are code inept (like me), or have a web design services like Website Tonight (again, like me) and cannot upload/create new html or js files, here is a nifty website I found that will create a simple html pop-up code without the need for a new html page or js reference file. All you have to do is paste the code where you want your link to be.
http://www.a1ien51.8k.com/scripts/popupwingenV2.htm
I think it is fairly straight forward, but if you have any questions, just post them here and I am sure someone will have the answer. I am not sure if it will work in Myspace or Facebook, but you can try. If you do not know your meebo me URL, follow Weakoz's instructions here:
http://forum.meebo.com/viewtopic.php?t=7293
Hope that helps some people out a little.
-HM
TIP - I decided that a simple text link was not flashy enough for my site, so I decided to take a png of the meebo me pop-up in its inactive state (gray with "click here to chat with ____") and use the image as my link. So now, when my guests click on the image (as it already asks you to do if you want to chat) the pop-up comes up and connects to me.