Half-Life 1 has camera bob, set "cl_bob 0.1" to see it in action (it is set to 0.01 by default). Perhaps you just aren't noticing the subtle effect? Feel free to up the cvar for your play.
Oh cool. Nice to see it hasn't been removed. I think I didn't notice it as the effect is less pronounced then the CD version.
Nothing extracted yet.
The retail edition of Half-Life had the camera bob left and right while strafing. This added a more realistic feel to movement: http://www.youtube.com/watch?v=HNR-hgZzkwQ&feature=player_detailpage#t=68s. The steam/linux version has removed this feature. It would be nice to have an option to enable it.