Long story short. They are putting in ALOT of changes into GW2. One of them is they are removing the free server transfers. This is causing ALOT of guilds on our server choosing to move to more populated servers because ours was losing pop. I was on prime time... it wasn't half of what it was 3 months after launch. There are alot of us moving to Jade Quarry because they have the lowest NA pop count, but highest EU and Oceanic count. Meaning WvW 25/4. They also have the most DAOC/Warhammer players anywhere in the NA. They are currently #2 as NA servers go. Move before the servers get full. While you can.
You click on 'world Select' at character selection. Its at the bottom left. You can only switch once every 7 days. Currently alot of guilds are holding blackout times to lower population so people can transfer. They are happening at 0:00 Zulu. - Thats 3pm EST, 4pm Centeral, 5pm moutian, 6pm PST