Don't close it, since it's not costing you anything. Right now, it's just adding another month of clean history to your reports, every 30 days.
Please read fused's "Closing Credit Cards", linked in my siggy.
* 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