I think C&C was my first RTS. I remember waaaay back in the day, downloading a demo of it which was like 50mb, back then we had dialup so I'd leave it downloading overnight and it would fail part-way through, then I'd try again the next night... I did this for like a week before it finally finished. I played that freaking demo over and over. Pure awesome.

Any oldschool mac users out there (I mean from back before Mac's were cool you fucking dorks) remember escape velocity / escape velocity override? (If escape velocity nova was your first EV game then you do not count.)