The press release which announced that Nokia starts an open source development partnership with Apple is quite interesting:

By adapting WebCore and JavaScriptCore components for its smartphone platform, Nokia and other Series 60 licensees will be able provide a rich Web browsing experience that takes full advantage of today's fast wireless networks and advanced mobile devices.. According to the "Smartphone360" study - Nokia-conducted consumer research among Series 60 smartphone users - over 50 percent of data traffic was generated by browsing.
"Nokia is excited to enrich Series 60 with optimized mobile Web browsing. Open source software is an ideal basis for development since it enables Nokia to leverage and contribute to speedy software innovation and development. As a result, the entire Series 60 value chain, from manufacturers and operators to end-users, will benefit from the flexible architecture, full Web compliance and a truly enjoyable user experience," said Pertti Korhonen, Chief Technology Officer, Nokia.

See also:
Interesting thoughts from Russ concerning the new partnership between Apple and Nokia.