The Greatest thing ever just happened

Yeah, that's how it works.

So, if I buy Day of Defeat, do I get all classic games?

I... I threw away my old Half-Life disc when I moved house a long time ago. :(

Are you sure that your copy of DoD wasn't part of a pack box like Blue-Shift Special edition or something like thta? Cause I remember I had one of such boxes which included all of those games..The first games I linked to my account actually :P

Yeah my Half Life Anthology activated a crap ton of games as well, every now and then I seem to get an old Valve game as well because I didn't start off with all of them. I'm hoping for a Left 4 Dead activation because L4D 1 is the only Valve game I don't own I believe.

Yes, if you activate any retail version of older valve games on Steam they give them all to you. You can still find boxed copies of CS or HL in bigger Best Buys. I got almost every valve game made when I bought the CS box and an orange box. Since then I have only needed to buy l4d, 14d2 and portal 2 to stay on top of things.

Nice :D !

it was not Part of a set it was an original boxed (and discounted judging by the price tag) version of the game. Also would it be possible to activate another old steam game and gift the extra games? or will it not let me do that or something dumb.

It's great isn't it? I actually tried to do this the other day with my Half Life: Game of the Year Edition disc I bought back in 1999. However much to my dismay it turns out that I must have created a Steam account (via an update years and years ago perhaps) and now I can't consolidate the license into my wasabinator account. It's great that Steam does this (license key registering) but not so great that they are very inflexible merging accounts. Support steadfastly refused to transfer the license even though I proved I am the legitimate account holder, although they did help in tracking down the old account name which I had totally forgotten. So I guess I will need one of those account switcher utilities or will try to win the licenses here :)