LAST EDITED ON 07-29-07 AT 06:08 PM (EST)You might check out http://www.thefutoncritic.com/home.aspx
They usually have all the press releases with this info for all the networks.
http://www.thefutoncritic.com/showatch.aspx?id=greys_anatomy has the premiere dates, they will also likely have the info if any of those dates change.
Summertribe and the living is easy!
ETF link