I meant to post this yesterday, but with a 3 hour trip to IKEA (Yay, Swedes!) I didn't even get to surf the internet yesterday much less play. But on Friday night, there was ONE keep not taken by Order in all of Tier 2. A group of CoWs, members from War Dogs, and many others stormed The Cascades of Thunder in Ellyrion.
It was rough going on first, but once everyone was in synch, the Hero witch fell and the Keep was ours!
Outside of the top floor there's an interactive "standard holder" or something along those lines. Your guild simply needs to have a Standard Bearer on hand, and one standard in his/her inventory. Deploy the standard, right click the holder, and voila.
Casualties of WAR owns the Cascades of Thunder keep. Check out the screenshot below to see our banner (sans logo, as we're not of high enough rank yet) flying on the bugger.
Not sure exactly what bonuses doing so netted us, as there was no clear indication of anything happening as a result of it. But as you hovered over the map, you'd see that the Keep was claimed in our name. If you were AT the keep and you click the guards, or NPCs, you'd see our Guild name underneath them.
Yep, it pretty much rocked, and I'd say it's something we should be doing whenever we claim a keep from here on out. Provided we have the funds to support it.