"..Half-life 2 has gone gold, but before you rush to buy it beware! This is from the release notes:

A. DRIVER ISSUES
The copy protection used on this disc is potentially incompatible with the following CD drives:
Sanyo CRD-256P / Sony CDU77E / Acer CD-624a / MATSHITA UJDB110 / Various Pioneer DVD models / All Yamaha CD-R's / Pioneer DR-A01S / Pioneer DR-A24X / Samsung SCR-1231..Also, many really old CD-Rom's will have problems too..."