For Shanghai calendar of events, like exhibitions and festivals www.meet-in-shanghai.net/events.php

For every fresh news, Smartshanghai is your best choice for nightlife, art and culture updates www.smartshanghai.com

www.shanghaiist.com is the insider's blog to Shanghai.

http://www.shanghaidaily.com/

For expat talking about Shanghai--Living and woring in Shanghai http://shanghaiexpat.com

City Weekend is a great free magazine about events and attractions in the city that can be picked up in bars and cafes around the city.  Their information is also available online: City Weekend

That's Shanghai is a free monthly magazine also found around the city in similar places as City Weekend.  A database of their information has been pooled with Asiaexpat's resources: http://shanghai.asiaxpat.com/