As the Pulitzer Prizes for journalism were announced, Nielsen Online released data on unique visitors to online news sites for March 2009. MSNBC, CNN, and Yahoo! News led the way, with each showing gains over last year’s traffic numbers. The BBC (up 61%), Fox News (up 48%) and McClatchy Newspaper Network (up 20%) reported solid gains while, Gannett Newspapers (down 11%), USA Today and CBS News (both down 7%) slid down from last year’s mark. The NY Times, which led all outlets with five Pulitzers, drew 7% more visitors than …