Brutorz Bill's Dragonstar Page: Contains a lot of information, mostly pertaining to converting Alternity for use with the Dragonstar campaign setting. Content requires Adobe Acrobat Reader to view.
Chrysalis - Campaign to the Stars: Chrysalis explains a Dragonstar campaign being ran that deals with a crew piloting a super advanced proto-type starship.
Darkstar: The campaign site for Darkstar, a game playing out in the Dragonstar universe.
Exodus: An alternate campaign setting for FFG's Dragonstar.
Fantasy Flight Games - Dragonstar: The official Dragonstar website.
Starfarer's Netbook: Contains new rules, classes, weapons, etc. for Dragonstar. Not a lot content yet.
Yahoo! Groups: Dragonstar: The official mailing list for the Dragonstar campaign setting. Has over 700 members and is fairly active.