Blaster Launcher for life!!! I still can't believe the game needs 4Mb RAM to run and how many different aspects there are to it and how much control over everything you have.
Some things that I wish they had in the new xcom that were in the original were
Multiple Bases,
Control over your interceptors (Patrolling them over certain countries to gain favour),
Attack ships with more than 1 interceptor,
Free Aiming , so you could just shoot out a wall and make your own path,
Each soldier having unique stats ( Not just a move once and shoot or move really far and don't shoot ) ,
Dropping and picking up weapons during the mission,
Multiple Research and Engineering projects which you get to assign the capacity of each,
Critically wounded or stunned aliens could just get up and start fighting again ( Unless you take their gun
),
Buying and Selling of equipment ( Literally everything from ammo clips to scientists to interceptors ),
Base defense missions where your base is exactly how you've constructed it and it has the soldiers etc that are present at that base.
Not to mention the fact that the music and atmosphere is scary as hell... *HIDDEN MOVEMENT*
I am actually gonna start it up tonight and have another play through, I've gotten all amped just thinking about how awesome it is.
I didn't finish it when I initially got it because of after many restarts on Ironman mode I eventually made it to a point where I had the Gollop chamber and a bug caused the aliens to spawn on top of my snipers and ended up wiping my entire squad :-( This time I just played on Classic without ironman so I could guarantee completion! 
