Eberron, based on the votes of logged in members, is the Ultimate Product of 3E.
Logged in members voted as follows:
Eberron: 159
Pathfinder: 134
Unearthed Arcana: 92
Among total voters, Pathfinder led with 319 to 316 for Eberron (UA got 140). However, as noted in the first post of that thread, it was a public poll, and that could be used to determine the winner. Given Eberron clear advantage in logged in members, I am comfortable in declaring it the winner!
Congratulations to all the winning products. And thanks to everyone who voted.