From Pubbers to Puggers Overnight

Group founded by Lovebone to drag pubs out of vanilla vs and introduce them to competitive L4D2.

A place for players new to competitive L4D2 to learn and improve their skills and teamwork before moving on to play with higher tier players in groups like Hotmess.

Members can feel free to post announcements any time they want to start a pug. Please don't spam announcements, use them responsibly.

Left4Dead Nation - A great resource for information about different configs, place to interact with other members of the community, a good place to find an answer to a question you may otherwise have a hard time getting information about.
www.l4dnation.com

L2L - A group where matches are played either once a week, or once every two weeks with mentors calling the shots to help players learn new strats from great players. Matches are streamed on Twitch usually with a cameraman and two casters.
http://steamproxy.net/groups/l2lpug

NA Pug Groups
Dustin's Confogle http://steamproxy.net/groups/dustinsconfoglgroup
Sir Please - http://steamproxy.net/groups/SirPlease
Hotmess Pug - http://steamproxy.net/groups/hotmessgroup
Hotmess Mix - http://steamproxy.net/groups/hotmessmix

EU Pug Groups
EMC - http://steamproxy.net/groups/European-Multigaming-Community
(sir please has several euro servers, and hot mess has a couple as well)