We put together a couple of RSS feeds for your aggregating pleasure. You can now subscribe to feeds of MSDN articles written by security experts Michael Howard and Keith Brown. These feeds will work in your aggregator, or you can even read them directly in Internet Explorer.
If everything works the way it should, you'll get a new entry any time each of these guys publishes a new article. Mark is putting together a page to make this all easier to read. I'll post a link when it's live.