It's there:

Pack includes almost every game from series:
The Even More Incredible Machine (includes The Incredible Machine with new puzzles), The Incredible Machine 3 (Windows compatibly The Incredible Machine 2 with new interface and enhanced graphics), Return of the Incredible Machine Contraptions and The Incredible Machine - Even More Contraptions.

Do you remember watching with amazement when those cartoon heroes constructed machines to catch someone or start something? Those very complicated Rube Goldberg-like ones with knives, toasters, anvils etc?
Or did you ever wonder how it would feel to construct a mouse-powered device to cook some eggs and launch a rocket? Well, the answer for it is here!
Build monkey or mouse-powered machines, use lasers and fire fireworks, start fires using a bowling ball and flint, throw things with anti gravity platforms or a jack-in-the-box or crack open an aquarium with a cat, mouse, alligator, cannon, cheese and more!!!

http://www.gog.com/en/gamecard/the_incredible_machine_mega_pack

FUCK YEAH! I loved this game so much it was the first (and one of few) game I ever pirated. I'll gladly buy it now to make up for my stupidity back then.

-edit-

One thought, is it going to be on Steam?  I'd rather buy it there if it is.

should be on steam..

I looked for it but didn't see it so went ahead and got it from GoG.

the Interplay games took a while to appear on Steam, it should take some time until TIM's released on Steam, if it ever does

lol I have the Incredible Toon Machine. It was so much fun to make levels that would mess with the cat.

I loved that game as a kid!