I'm pretty sure that you don't get a score ding from a reported over-the-limit, but your other CCC's might notice it and rate-jack you, depending on whether they practice universal default or not. Obviously the high util was hurting.
I would definitely be concerned about Citi raising your APR. If this was a one-time mistake, they might forgive you, but you should keep checking to see if this happens. If it does, I'd call customer service during traditional US business hours (say 8 a.m. - 6 p.m. Eastern) in hopes of getting a supervisor who can exercise some forgiveness. And your best bet will be to continue knocking down the balance as quickly as you can.
Good luck!
* Credit is a wonderful servant, but a terrible master. * Who's the boss --you or your credit?
FICO's: EQ 781 - TU 793 - EX 779 (from PSECU) - Done credit hunting; having fun with credit gardening. - EQ 590 on 5/14/2007