Star Wars: The Old Republic was just recently released, and naturally the pressure is mounting on the game servers. Many are already overflowing with players and Bioware are now advising players creating a new character to avoid a certain set of servers.
Bioware recommends you steer clear of the following servers:
US-based servers
The Harbinger - US West Coast - PvE
The Swiftsure - US West Coast - PvP
The Fatman - US East Coast - PvP
EU-based servers
Bloodworthy - EU English - PvP
Frostclaw - EU English - PvE
Legions of Lettow - EU English - PvP
The Red Eclipse - EU English - PvE
Tomb of Freedom Nadd - EU English - PvP
If you still want to join these servers, you can expect waiting times of several hours.