We now have our guild city reserved in the Lachleish Plains in instance 22. You can travel here through the travel to my guild city option, will keep this updated as construction progresses.
Update 6/30/08 -- All Tier 1 Buildings Are now completed.
Also now have the outer wall completed, as well as all of the quests to get us to Tier 2.
Update 7/10/08 -- We now have the gold to upgrade to T2 Keep as well, we're just needing the Tier 2 Resources.
See more info in the forums to see more info and pictures of our city.