Unzipping files just requires you to open one in finder, at which point it will extract it to the same folder so you can just open it. Also, if you download an archive with safari, it will decompress it automatically, leaving you with just the extracted content, and the zip file in the trash.
To your second question, sadly I think the domains where the games were haven't been renewed. However, thanks to a friend i got my hands on the games, and even managed to extract most of the ones that normally came wit windows EXEs like ghost driver. I'll try to get them uploaded for you.
The twins of Mammon quarrelled. Their warring plunged the world into a new darkness, and the beast abhorred the darkness. So it began to move swiftly, and grew more powerful, and went forth and multiplied. And the beasts brought fire and light to the darkness. - from The Book of Mozilla, 15:1