1 - Populous II
2 - Some platform games, like Switchblade, a genre seemingly forgotten since 3D graphics came into its own.
3 - SWOS
4 - Worms, the original version
5 - Shadow of the Beast 1 and 2 - just a little less impossible to complete this time :-)
oh, and:
6 - Desert Strike. A new shiny smooth version. Just right for the current political climate :-)
and I don't believe anyone hasn't suggested this yet:
7 - Speedball II :-)