The Guardian seems to think it has found the identity of the Climategate leaker:
A scientist at the University of East Anglia has been questioned by detectives investigating how controversial emails were leaked from the campus’s climate research unit.
Norfolk police have interviewed and taken a formal statement from Paul Dennis, 54, another climate researcher who heads an adjacent laboratory.
The leaked emails from the head of the unit, Professor Phil Jones, surfaced just before the Copenhagen conference in December and caused a furore because they suggested that data which did not support theories of global warming was being deliberately withheld. Dennis denies leaking the material.