Blackmoor was one of at least two settings that vanished when TSR acquired them. Does anybody remember the Islandia setting? At least the Blackmoor setting had some titles see print, Islandia vanished away with ne'er a ripple. (Too bad I had enjoyed the setting when it was the property of The Companions, but Roger E. Moore apparently took exception to the fact that the villains were actually running around doing evil things rather than sitting in their dungeon waiting to be slaughtered... This was abot the same time that their R.I.P. game became vaporware.)
The Auld Grump, who still owns Curse on Hareth and Brotherhoood of the Bolt/Plague of Terror...