It's more of as media separation than an outright actual divorce. Starting in October, Newsweek magazine, which is regularly hosted on the MSNBC site, will spin off their web site giving them a greater control of its editorial and advertising destiny. From Bloomberg (via Iwantmedia):

''The new contract with MSNBC replaces a seven-year agreement that expired in June. Washington Post is investing in its Web sites to attract advertising revenue lost at the flagship newspaper and at Newsweek. Last month, Washington Post and CBS Corp. said their Web sites will share political content related to the 2008 presidential campaigns.''

(image via newmediamusings)