According to Tutorial Blog:
http://tutorialblog.org/top-10-sites-for-web-designers/
Here they are:
http://www.alistapart.com
http://www.thinkvitamin.com
http://www.designmeltdown.com
http://www.uxmag.com
http://www.design-feed.net
http://typeforyou.blogspot.com
http://www.pingmag.jp
http://www.digital-web.com
http://www.9rules.com/design/
http://www.smashingmagazine.com
Not sure I completely agree with the list as there are some others of note.
http://www.k10k.org/
+ we have a bias to support local Australian design community sites DesignisKinky and Australilan in Front
