Owners of the least expensive model of the MacBook have been reporting cracks and blemishes showing up on their machines for some time. Apple has been covering repairs of cracks in the white plastic shell on a case-by-case basis.
Courtesy of Apple
According to AppleInsider, Apple has expanded the repairs it will cover to include cracks on the bottom of the white MacBook as well. Additionally, Apple is informing its service partners that repairs for cracked cases on white MacBooks that are out of warranty will also be covered.
The cracking issues only pertain to the white 13-inch MacBook model, and not the newer unibody models introduced last fall.