Upgrading from:

PieCharts`

As of Version 7, the Pie Charts Package has been integrated into the Wolfram System.

PieChart is now a built-in Mathematica function:

Version 6.0 << PieCharts`;
PieChart[{.2, .3, .1, .5}]

Specify radial spacing:

Version 6.0 << PieCharts`;
PieChart[{.2, .3, .1, .5}, PieExploded -> All]