Just an observation after having been away from Hyperborea for a few years.  So I skipped the most recent adventures, but we had played everything up through Sea-Wolf's Daughter until the campaign ended with a near TPK (one PC survived only to later sacrifice himself in Tegel Manor).  I recently grabbed Vanishing Isles of the Summer King, Thousand Eyes of Thaumagorga, and Oblation Slab of the Hepatomancer and I'm thoroughly enjoying my read-throughs.  Good adventures, tied to the setting, but offering a fair amount of choice and DM freedom.  Excellent presentation and artwork.  Not too minimalist like OSE, but not too verbose, like DCC.  Quite dangerous but survivable.  And a free bookmark with every title ain't too shabby either.

On a related note, my homebrew mashup of Swords & Wizardry, Hyperborea, and Adventures Dark & Deep is coming together nicely.  I'm updating my gazetteer now, changing a few things and cleaning up inconsistencies from earlier versions.  Also actually typing it this time rather than writing it out by hand, so I can more easily make changes in the future.  The fact that I had Glynn Seal do my maps is sweet too, since Hyperborea is bolted on as my North Pole.