I'm a big interactive fiction enthusiast, and lately I've been looking for a good graphical Z-machine emulator. I currently use Frotz, but it's terminal-based and a bit cumbersome. I tried XZip and found that the status-bar being in a separate window was annoying as ****, as well as still having to load games from the terminal.
I've found a thing called QTads, which is an excellent graphical TADS interpreter, with a window-based game loader. I'm looking for something along those lines that will play Z-machine games.