All of my announcements are sent out via the email@example.com mailing list, which is an feed. I am the only one who posts to this list.
In order of likelihood, my announcements will describe:
1. Newly posted articles, pertaining to IT-related issues, which I've written.
2. Summaries of blog postings
3. Upcoming conferences where I will be speaking.
I write a blog on Disciplined Agile Delivery (DAD) about disciplined approaches to agile development and a blog on IBM DeveloperWorks about how to scale agile development.