I haven't even fully figured out Riven and here those rendering madmen, the Miller brothers, are getting ready to release Myst III: Exile unto the world (Q1 2001). I know it's a pretty divided crowd as far as the love/hatred of Myst, but I still maintain that the 17 hours it took us (I had a partner) to solve that first game of what's now "the Myst trilogy", was the best gaming experience I've ever known. Apparently, this time around 3D hardware is utilized, allowing full 360-degree view rotation, etc. Can't wait to check it out!
See the Myst III: Exile trailer movie here. (quite impressive!)