Information on the show:

Official Syfy Site
The Vega Handbook (Syfy’s “Enter Dominion”)
Online versions: US English – UK English (now offline) – French (now offline)
PDF versions: US English – French – GermanDominion: Revelations (Syfy website)
Online versions: US English – UK English
Dominion BR – Brazilian Fansite
Dominion on vk.com – Russian Fansite
Dominion Wikia
Dominion on Wikipedia
IMDb
spoilertv.com
TVguide.com
TVtropes.org
Three If By Space: Meet the Cast

Facebook:

Dominion’s Angels (International Fan Group)
Dominion Fanatic (International Fan Group)
East Coast Dominion’s Angels (Spoiler group to discuss during and after airing)
Dominion UK (UK Fan Group)
Portal Dominion Brasil (Brazilian Fan Page)
Official SyFy Dominion Facebook Page (accessible from US only)
Dominion Facebook Fanpage

Tumblr:

dominionfans.tumblr.com
fuckyeahdominion.tumblr.com
from-the-stratosphere.tumblr.com
michaelthearchangelfan.tumblr.com
legiondominion.tumblr.com
dominionsource.tumblr.com
dominionsyfy.tumblr.com

Others:

Dominion Fan Listing
MMXVDB Fan Art
dominion-syfy.livejournal.com

Fan Fiction:

FanFiction.net
Archive of Our Own
Tumblr Fanfic Feed for Dominion
The (Mostly) Gen Dominion Fanfic Rec List

YouTube:

Halona Holmes’ Dominion Channel
Dominion YouTube Fan Channel

Reviews/Recaps/Blogs:

Empyrean Steel
TeeJay’s Wanton Ramblings about Dominion
Dominion UK Blog
More links on our separate reviews/recaps page

Transcripts:

Full Episode Transcripts
Closed Captions Dialogue

Screencaps:

springfieldspringfield.co.uk
screencapped.net
kissthemgoodbye.net

Dominion cast:

tomwisdom.net (includes a message board)
roxannemckee.net
anthonyhead.org

It would be great if you could report any broken links or more link suggestions to dominionfans@gmail.com.