Here's a few ones I've picked up in my experiments and online
nb_rush - Makes all the zombies spawned rush at you in constant madness, similiar to force panic event.
sv_infinite_ammo 1 - Infinite = no reloads! Be just like Rambo.
sb_give - Gives your team mate any item you specify.
z_health - sets the health of regular zombies. Specials are not affected.
Also, if you follow up hlife_hotdogs command with director_force_panic and then z_speed 1000, the zombies come at you ridiculously fast and continuously.
go_away_from_keyboard - gives control of your character to a bot and spectate, great for online games so you can secretly wreck havoc without anyone knowing who's doing it.
Also, I found this one of the facepunch studios forum. Its classic.
Bind k "explode; say HAHAH You guys are fucked now!; ent_fire !self setteam 3; z_spawn tank"
Someone must use this in an online game and see how everyone reacts.
z_throwforce 10000 - the default value is 2500. This determinds how hard you throw things. at 10000+ propane tanks, when thrown, blow up on contact. Make yourself into a kind of long-range tank of doom All you have to do is bind a key to "give propanetank" set it to 20-30k for epic awesomeness.
I'll update as I find more.