Hackney Gazette - Masterplan for borough centres extended
Businesses for sale: in Hackney with more specific areas like Clapton and Stoke Newington covered.
Hackney Business Information Library - just contact details
Hackney Business Today - which looks a bit out of date
HBV - used to be Hackney Business Venture, helping and advising businesses for 24 years.
Innovatory - not sure how local this is, no news on its blog since May 2008.
Olympic Delivery Agency
List of publications based in and around Hackney from iCity&Hackney business services
Hackney Small Business Advice - more business centre details