http://venturebeat.com/2011/12/16/left-4-dead-short-film-features-space-marines-video/

This is the coolest thing for L4D2. It mods your menu so that you can play all the mutations and some custom ones too. Here is the link:

http://forums.steampowered.com/forums/showthread.php?t=1529433

pasiri.vpk 7/17/2010
plants_vs_zombies.vpk 6/24/2010
readme.txt 4/27/2010
resident_evil_1_beta.vpk 4/25/2010
rmstitanic.vpk 10/31/2010
roadtodeath.vpk 10/16/2010
sleepwiththefishes.vpk 10/18/2010
soccerstadium.vpk 3/5/2010
SolemnBlackout.vpk 10/14/2010
soundpack_l4d2_tourettes_tank.vpk 6/19/2010
spacejockeys.vpk 6/2/2010
subwayhardcore.vpk 7/26/2010
supermarket_funtimes.vpk 6/5/2010
sv_excommunication.vpk 5/1/2010
sv_tower_v9.vpk 3/19/2010
the outbreak.vpk 8/22/2010
the road to nowhere.vpk 1/25/2010
theisland.vpk 12/30/2009
theorange.vpk 7/18/2010
tt.vpk 8/23/2010
westend_beta2.vpk 1/29/2010
wormwoodv2.vpk 12/12/2010
wthbeta.vpk

l4d2l4d1_deadair.vpk 10/24/2010
l4d2theatre.vpk 11/19/2010
l4d2unreal.vpk 3/26/2010
l4d2_crashbandicoot2.vpk 10/21/2010
l4d2_diescraper_b3.vpk 11/6/2010
l4d2_janssen_little_dog_too.vpk 9/30/2010
l4d2_one4nine.vpk 11/14/2010
l4d2_ravenholmwar.vpk 6/25/2010
l4d_disturbed_in_the_suburbs.vpk 12/12/2010
left4homeeng.vpk 9/16/2010
levillage3.vpk 10/31/2010
lost.vpk 8/18/2010
mario2.vpk 10/18/2010
mic2v80.vpk 10/15/2010
midnightrr2.vpk 8/21/2010
mobstadium2012l4d2final.vpk 9/9/2010
nightterrorl4d2.vpk 6/5/2010
nmmodified8_4.vpk 7/3/2010
noesis.vpk 3/1/2010
nomeltdown.vpk 9/16/2010
ns4z.vpk 5/6/2010
Outbreak.vpk 12/13/2010
overkill.vpk

deathaboard2.vpk 8/12/2010
deathtripv4.vpk 12/4/2010
death_hour.vpk 9/27/2010
detourahead.vpk 11/6/2010
dir.txt 12/16/2010
displaced.vpk 4/30/2010
drop_dead_2v1.2.vpk 5/28/2010
echo.vpk 6/7/2010
echo_campaign.vpk 6/1/2010
escapefromparkdale.vpk 2/19/2010
freepassage.vpk 8/10/2010
greyscale.vpk 8/23/2010
hallowedwinter.vpk 11/5/2010
hauntedforest.vpk 10/16/2010
heavencanwaitl4d2.vpk 10/10/2010
hellhouse2.vpk 1/15/2010
helmsdeepreborn.vpk 11/30/2010
hidden survival maps.vpk 9/2/2010
hoodoo_l4d2.vpk 7/10/2010
indiana_adventure_v3.vpk 10/16/2010
jsarena2.vpk 5/8/2010
Ju[s]tice_house_survival.vpk 6/9/2010
l4cake2.vpk

2019.vpk 8/10/2010
2145.vpk 10/31/2010
2evileyes.vpk 7/5/2010
4below.vpk 3/10/2010
7hours_later_l4d2.vpk 12/11/2010
atticaregionversion2a.vpk 6/1/2010
btbh3.vpk 9/20/2010
carriedoff.vpk 9/3/2010
centro.vpk 9/19/2010
city17l4d2.vpk 6/30/2010
citycenter.vpk 10/27/2010
damit.vpk 7/16/2010
darkblood2_v3.vpk 10/19/2010
dead street 2.vpk 7/10/2010
deadbeforedawn2.vpk 11/26/2010
deadcity.vpk 8/12/2010
deadcity2.vpk 10/18/2010
deadhighschool.vpk 7/31/2010
deadly_dispatch.vpk 9/6/2010
deadontime2.vpk 2/25/2010
deadseries.vpk 12/15/2010
dead_death_b2.vpk
12/4/2010
death sentence.vpk