Here is their official thread https://bitcointalk.org/index.php?topic=280806

Have you tried contacting them via this email ? support@bter.com They might give you ETA when site will up again. Couldn't find anything about this downtime in their ANN thread.

https://bitcointalk.org/index.php?action=profile;u=80096 is the one who have created that ANN thread here so he/she might help you but it looks like that account haven't made any login in last 6 days.

I haven't used them till now.