Looking at those environment pics, the resilience of Source engine continues to amaze me. To think its based on Quake 1 engine brings a tear to my eye.
I remember playing the actual beta, it looked so cool but it crashed and had errors everywhere I'm so glad this mod exists. Though sometimes I think it would be nice if developers packaged beta levels and stuff as a bonus, it always interests me seeing the differences from the final game.
My wish is that the Missing Info team will get us a fixed wc mappack. (For those who don't know what that is, first of all, shame on you. The wc mappack is a bunch of maps for the hl2 beta. It features lots of stuff that isn't in the final game like the manhack arcade. Missing Info is pretty awesome and I'm hoping to see an update soon!