"The fast growing popularity of RSS (really simple syndication) means that the technology will pose increasingly significant problems for IT security professionals this year, new research has warned.

ScanSafe's latest web security report notes an explosive growth in the use of RSS feeds to pull updated content via HTTP and XML rather than having it being pushed to them by SMTP.

"With this trend expected to increase in 2006, malicious code writers are expected to take advantage by hijacking existing feed clients, causing automatic downloads of new worms and other web threats," the report warned." - SC Magazine

I for one agree with this. In particular I see a bigger potential for rss feed duplication (copying an existing feed) and inserting ads in order to generate income.

Story Link: http://www.scmagazine.com/us/news/article/535387/rss-malware-plague-predicted-2006/