Yeah, not sure what kind of versions they have atm, but by the time I bough my HL2 there was 3 versions, standars, colector and gold edition.
The colector edition lets you play most of the games ever released on steam without need to pay for them, eg KungFu, darwinia, HL1, CS1.6, etc, etc, etc...
I had to pay for HL2 EP1 though :roll:
Also Im not sure if The Ship will be free on my steam acc, but I can't download it this month, I already crossed my ISP bandwith traffic!