I've been working on a port of Frotz to the .NET language. I hope to post some about the experience of porting it to .NET, but for now, I wanted to get it out there.
You can download it here.
It's fairly complete, can play all Infocom games except the graphic ones, and it can probably play most of the other ones.
If anybody is any good with Text and some minor graphic layout issues, I could use some help getting things finished up. <grin>