Take a look at the start page of Apple’s updated website. Very blog like with its chronologically-ordered information and XML buttons for subscribing to RSS webfeeds.
While it’s not a blog by the accepted definition (no commenting nor trackbacks, for instance), this is a good indicator of how the current differentiators between ‘normal’ websites and blogs are beginning to blur.
It surely can’t be long before we can expect to see more ‘normal’ corporate websites as blogs. And vice versa.