I hate html in emails, and I guess Outlook 2003 now blocks it by default (because otherwise it would spread viruses, which all previous versions of Outlook have been experts at). Someone brought up this issue from a designer’s point of view. A lot of the newsletters that people actually signed up for were being bounced back. Some people agreed with me that even if readers can turn the blocking off, would they want to? Journalists can track traffic with html newsletters, but users don’t care about that.
As part of a class project I’ve been reading the Online-News mailing list and responding to some of the issues and discussion brought up there.