Apple have shaken off the not-invented-here mentality that dogged the Macintosh for a long time, and now are keen to borrow and share technologies. For example, the iPod is mostly based on off-the-shelf components, including a third-party embedded OS, and there is a lot of open-source software under the hood in MacOS X (i.e., large swathes of FreeBSD, CUPS, Perl and Python), and now KHTML is in Safari. Probably a good choice; it'll save Apple diverting resources to reinventing the wheel, all for the very minor cost of sharing innovations in this area with the open-source world.
Please keep comments on topic and to the point. Inappropriate comments may be deleted.
Note that markup is stripped from comments; URLs will be automatically converted into links.