Here are a list of resources that I use daily.  If you have some suggestions, feel free to let me know in the comments.

Mobile

-        Twitter.com

-        Momentile.com

-        mGive.com

-        SMS Text News.com

Writing

-        CopyBlogger.com

-        GetitinWriting.biz/blog/

Web/Internet

-        aListApart.com

-        Google.com/trends

-        SpringWise.com

-        SocialMeter.com

Advertising

-        ScaryIdeas.com

Search Engine Optimization

-        SEOBook.com

-        SEOMoz.org