iVillage has regional boards, but nothing geared toward specific military installations.
Like Jess said, I'd check with the FRG to see what they have available. The FRG for DH's ship has a Yahoo forum for spouses/ family. I find it very helpful since I live a good distance away from the base & don't make the monthly meetings. It's also been a good way to connect with other spouses from the same command.
~Allie~