I thought Pruhome was all but over.
Two points:
First, it is important not to confuse Prudhoe Bay with all of the Alaskan North Slope, although some media reports will mix these terms up. Prodhoe Bay is one of more than 30 fields Oil fields already drilled on the North Slope. But it was the first and was the largest.
Production is reduced, but continues. Currently there are a lot of enhanced oil recovery methods being used to recover more of the oil in place. Prudhoe Bay field is currently expected to recover ~60% of the oil in place, which is very high compared to most fields.
Of the fields already tapped (important distinction) Prudhoe Bay remains the largest remaining reserve with current production technology.
At the time of this report (most current) Prudhoe Bay was producing more barrels per day than any other field. But I believe since then (2006 data) Alpine may have exceeded it.
More info at:
Alaska, Division of Oil and Gas 2007 Report
Section Three, Historic and Forecast Production
http://www.dog.dnr.state.ak.us/oil/products/publications/annual/2007_annual_report/3_HistProj_2007.pdf