The "black and white Mac" implementation of Risk made it such a breeze to play that I could barely tolerate the physical setup and teardown of the actual board game after it.

To this day I'm still looking for a good large electronic game-board touchscreen. (I know there have been some stabs at this... PlayTable?)

Netrek made its way onto PCs also and I remember playing it in probably 1994/95 when it was about the only game our crappy rural DSL could handle. Tons of fun and the requirement for strategic teamwork was probably only rivaled by RTS games.