I think it would be useful to have the server's name in the application title. E.g. "Pokemon Online: Beta Server". It would help if you're in multiple servers at one time.
Yea, I agree. It's not something that's of a high priority, but it is something that's nice to have. As it allows users to identify the correct server when windows are minimized. Instead of opening multiple servers and trying to figure out which server is what.
An extension of Steve's suggestion is having your current username also in the application title. E.g. "Pokemon Online: Beta Server - Professor Oak" This would be useful for when you have more than one username on a server at a time. E.g. me having both Scott TM and Professor Oak on the server at the same time.