Yesterday, Governor Spitzer, Mayor Bloomberg, MTA CEO and Executive Director Lee Sander and other officials kicked off the extension of the 7 line by unveiling a new sign in Times Square pointing the way to Hudson Yards. Ah, nothing like putting in signs for things that won't be ready for years - the 7 will reach 34th and 11th Avenue in 2013. The 7 line extension will cost $2 billion for the 1.5 miles......