Joseph Bloch of Greyhawk Grognard just released his fan production WG13: Castle of the Mad ArchMage. You wanna talk about people producing new and exciting stuff? This is it. It's my opinion Joseph was uniquely situated to give us something of a continuation after the cessation of Castle Zagyg, and did he ever!
I plan on using this with my Castle Zagyg: Upper Works boxed set. Joseph describes Level Two: The Deep Cellar, and includes a key, maps, appendices, and a host of fun encounters. This doesn't strike me as mere nostalgia, but as an effort to continue a worthwhile legacy. The goal is apparently a level a month of the course of 2009, which I'm very much looking forward to.
Joseph thanks me in the forward (though I cannot imagine whatever for), but those of us who loved old-school dungeons, Castle Greyhawk, and Castle Zagyg should be thanking him. A lot.