Tiara is Tilt's "Invite All Raiders" Application. It is designed to allow you to cut and paste a list of raiders (e.g. from your web based signup system) one raider per line (or type them in, if you can be bothered) then you can hit the "Check" button and see their online/offline status, wether they are already in the raid and which zone they are in.
Hitting the "Invite All" button does just what you'd expect too.
It was initialy developed exclsuively for <Rage of Ancients> of Azjol-Nerub and has been sucessfully used for many many raids, but I'm now making it available to the world, so suggestions for improvement are now welcome.
The next version will hopefully allow you to import the names from the WotLK in-game calendar system.