Dune 2 - absolutely amazing game! I totally loved it back then. Unfortunately, it's not something I can go back to: I tried it again a few years ago, and the controls are just too clunky now once you've been used to even just the next generation of RTSs (like C&C and Warcraft 2). They did do a remake, Dune 2000, with modern controls and that's a lot better. It's not the original though.
Ever played Dune? It's a kind of weird mix of genres. I played it a little but never figured it out. Reading it's wikipedia now, apparently it was a very successful game. Maybe I was just too young at the time.
I've said this elsewhere before, but I'll never have a moment on a computer like when the Dune 2 intro first started talking to me. We had a 386SX25 with a soundblaster, and at some point upgraded our RAM from 2 to 4mb. Apparently, that was enough for the game to start playing those voice lines - which I had never heard before. Like magic!