The fan-made remake of King's Quest 2 was awesome. I can't wait until they're finished with their Quest For Glory 2 remake.
There's a game called
5 Days a Stranger that's quite good for adventure/horror game fans. Its sequel
7 Days a Skeptic is decent too.
Oh, and any Mario fan is required to try out
Demo World: The Legend Continues. Picture Super Mario World. Now imagine it much longer, with more goodies, containing some of the most bizarre levels and most obscure secrets you've ever seen in ANY game, and 50 times harder. Even playing it in ZSNES and making liberal use of save states, it's STILL insanely challenging. Highly recommended.
How ya doing, buddy?