I also remember a couple of issues that were between the end of Paizo's publication and the beginning of 4e that were set in GH. There was either a revamp or expansion of Lost Caverns of Tsojcanth. I'm at work now, but I'll look it up when I get home.
There was one published in Dungeon 200 (covering 1-200) and another published in Dungeon 221 (covering 201-221). Dungeon 221 is the last issue published. Both indexes identified GH adventures (and articles I think) and the Dungeon 200 one also listed them by Adventure Path and by edition of D&D.
Both are still available for download via a D&DI subscription (a month's subscription is pretty cheap and gets you access to all issues) and it seems Wizards are also starting to release the post-Paizo issues on dndclassics.com so presumably both issues with indexes will appear there eventually.
EDIT: The Dungeon 221 index does not identify GH adventures but they are relatively easy to pick out.
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