Google acquires DoubleClick. From the official blog post:

This new partnership represents a tremendous opportunity for us at Google to broaden and deepen our inventory of available ads and to better serve both our publishers and users. Together, Google and DoubleClick will empower agencies, advertisers, and publishers to collaborate more efficiently and effectively, which will, in turn, provide a better experience for our users.

Wonder if I can buy DoubleClick space through Google AdSense now.