"Any application of technology must increase administrative efficiency, reduce long-term costs and enhance political transparency. In the end, elections are about choices expressed in terms of results and those results acquire legitimacy only through unanimous or widespread acceptance".It's important not to confuse biometric voter registration and verification with e-voting.
There are good reasons for adopting a biometric voter register while using a paper, or other physical balloting mechanism.
Background: Fighting Intensifies After Election in Kenya (New York Times - January 1, 2008)