Here are two articles from the April issue of the Web Marketing Association Interactive Briefing that you might find helpful.
Build Customers Extranets to retain and increase revenue – Customized Customer Sites can and should be a viable component of your best marketing practices arsenal.
Go Online to Reach the “Online At Work” Audience – Reaching the office worker with relevant advertising has always been difficult. The Internet overcomes these challenges and offers advertisers a true opportunity to effectively reach the “online at work” audience. To better understand the “online at work” audience, Burst Media surveyed over 11,500 web users 18 years or older on the online activities they engage in while at work (PDF).