Half-Life 2 Tweaks

[BetaMaster]

Ok, so, I've seen the tweak for slow motion (link below) and it was really cool. Then I started thinking, and there's gotta be more tweaks you can do. So, I thought, why not make a thread devoted to Half-Life 2 tweaks, where everyone will share their tweaks that they've discovered/learned about?
Basically, in this thread, if you have a tweak that you've done to the autoexec.cfg, or made your own config file, please post instuctions to use it below, or post a zip of the config file with info on what it does.
And please, if you didn't make this, please give credits. Thanks.

Bullet-Time
http://www.halflife2.net/forums/showthread.php?t=55911

Let's see how much we can mod Half-Life 2 without the SDK!

 

[TigerRei]

This has been stated elsewhere, but there are commands to change your max ammo. sk_max_<weaponname> # #

so for example, sk_max_crossbow 100 would set your maximum crossbow ammo to 100. Only problem is, once you set it, it reverts to default when the map changes.

 

[BetaMaster]

Ok, good start, good start. Anyone else know any tweaks?