The meaningful consent project has produced and commissioned a number of short reports into issues relevant to online consent.
Online Advertising: Auctions, Targeting and Tracking Dr Enrico H. Gerding, University of Southampton
Consent: Some basic questions of policy and approach Iain Bourne, Information Commissioner's Office
The psychology and behavioral economics of privacy Laura Brandimarte, Carnegie Mellon University
The biggest lie, and how to stop it Pär Lannerö, CommonTerms.org