The new H/G archive, or at least the one that rose from the ashes (honestly, no pun intended) of GT was PhoenixSong.net as someone mentioned above. I've also heard of GinnyPotter.com, but I have absolutely no idea what it's like.
I can't think of any post OotP H/G recs, but if you don't mind looking, PhoenixSong is where I'd suggest looking.
Oh, just thought of a couple. They were both started before OotP, however they're set post Hogwarts, I don't think they actually contradict anything in OotP and I would say that Ginny, in both of these, is a grown up version of Ootp Ginny.
Heal the Pain (http://www.phoenixsong.net/aibhinn/aibhinn.htm) by Aibhinn The New Professor (http://www.phoenixsong.net/michele40/index.htm) by Michele40
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I can't think of any post OotP H/G recs, but if you don't mind looking, PhoenixSong is where I'd suggest looking.
Oh, just thought of a couple. They were both started before OotP, however they're set post Hogwarts, I don't think they actually contradict anything in OotP and I would say that Ginny, in both of these, is a grown up version of Ootp Ginny.
Heal the Pain (http://www.phoenixsong.net/aibhinn/aibhinn.htm) by Aibhinn
The New Professor (http://www.phoenixsong.net/michele40/index.htm) by Michele40
Enjoy. :)