Just popped in here to talk War Thunder and amazed to see this old thread still ticking over nicely.
Nobody mentioned Quazatron though, that has to be desperate for a remake - there's one on retrospec, but it's not up to much IMO, this is game that needs to be remade with a little more depth and a lot more shiny, but the same basic gameplay.
Here's an idea - I'll update the original post in this thread with games that have been, are being, or should be remade if people PM me some links.... We'll probably just need the name of the game (maybe a link to an original review?) and a link either to it's nearest cousin, its faithful remake, or to a work in progress so that people can track them.
+1 votes for a lot mentioned btw.... Midwinter, Dungeon Keeper, Syndicate, Original railroad tycoon (transport tycoon would rock too but with full 3D or at least much more detailed resolution than current versions). LOVED covert action back in the day, I can't remember it fully, but I remember sinking hours into it.