From the Department of State, 10/02/2012:
On October 2, 2012, the Department of Homeland Security (DHS) Secretary Napolitano announced the designation of Taiwan into the Visa Waiver Program (VWP). Eligible Taiwan passport holders can travel on the VWP beginning November 1, 2012. However, potential Taiwanese travelers may apply for travel authorization approval through the Electronic System for Travel Authorization beginning immediately.
For additional information on the Visa Waiver Program visit Travel.State.Gov's Visa Waiver Program.