Link roundup for 8/23/08

A Guide to CSS Support in Email: Campaign Monitor put out a revision to its excellent guide to using CSS in email. They tested their finding on 22 webmail and desktop email clients for a comprehensive overview that they summarized nicely for quick reference.

Tuning and Feeding: My best practices for getting the most out of Twitter: Howard Rheingold has been chronicling online communities since long before most people have been online. He writes about his use of Twitter in Smart Mobs and describes his personal best practices for Twitter use and how these practices have made the service more useful to him.

A brief history of identity protocols: Eric Norlin of Digital ID World wrote a brief overview of the current identity protocols for CSO online.