fnordian is right in stating that Homo Erectus did have the first controlled use of fire. But the
Kenyan sites that he mentions, such as the baked earth at
Koobi Fora,are usually attributed to natural occurences of fire, and not contolled use by
humans.
The earliest site that everyone agrees is indicative of "controlled use" is the aforementioned site at Zhokoudian in China. This site is dated at about 500,000 years ago.