There are, right now, 6 servers listed as full, 6 listed as crowded, 8 listed as normal, and none listed as perfect. The servers might not have completely filled up yet, but it's likely that they will soon if more aren't added.
I wonder if the servers are added throughout the day?
I've actually seen a Pixie server, but today, when I went to change from the server I was on that was FULL to a PERFECT server, I didn't see the Pixie servier, and it in fact stopped at the letter L for server names.
It is becoming a popular game though. I can see why though, it's a ton of fun (and this coming from a mom of a teenager, so I'm not in the demographic target for sure :) )