Ramjet (http://www.ramjet.com) now offers the ability to upgrade the
new aluminum MacBook and the black bezel MacBook Pro to 6GB. The
company offers a 4GB SO-DIMM single module for US$599.
This 4GB module can be installed along with a 2GB module ($75) to
reach the system maximum of 6GB, These modules are fully compatible
with the latest Apple firmware, and are SPD configured for the
MacBook and MacBook Pro. These Ramjet 4Gig SO-DIMM single modules are
shipping now, and come with a lifetime warranty.