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Dulfy's written a guide for the upcoming planetary conquests system that guilds (and solo players to a lesser extent) will be able to participate in when 2.9 goes live for subscribers later this month.
It seems to have some pretty good rewards for both guild and personal conquests.
My SWTOR referral link for those wanting to give the game a try. (Newbies get a welcome package while returning players get a few account upgrades to help with their preferred status.)