Apple quietly(?) released a new beta of Safari one of the last few days; probably Friday. New User-Agent strings looks like:
Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en) AppleWebKit/51 (like Gecko) Safari/51
where before they were
Mozilla/5.0 (Macintosh; U; PPC Mac OS X; en-us) AppleWebKit/48 (like Gecko) Safari/48
(via metamark logs and Marcus on #perl)
Original entry with images and comments and stuff....