I've never played Half Life 1 or 2, so I can't say much about that. Do we have features from Half Life in Blockland? I haven't noticed any, yet.
There isn't nearly as many, but Gravity Gun was originally an HL2 mod I think, Crowbar, Airboat, Buggy and a couple of private mods. (Headcrab AI by Titanium, unfinished AR2 by Racer and so on.)
I do also like seeing how people used Blockland to recreate my favorite games, that's why I join every single HL2 or Portal remake server I see (I don't join TF2 ones because I already know they aren't good

)
Weird. I swear that the last time I checked Portal 2, maybe a week or two ago, it said it was coming out on February 4th. Now it just says it's coming "2011".
Well, I'm sure there's a good reason for it to come out later. No use rushing it. Thanks for the info. >_>;
Yeah its coming out in April now :V