I'm not quite sure what you mean by a digest. There is RSS for each blogger and the whole lot together. There is also RSS for each category and if you want the same for each tag its http://www.thoughtleader.co.za/tag/media/?feed=rss or replace media with the tag. There is also a daily email newsletter with the latest 15 posts. I guess we could make a feed for most popular but that would mean there is repetition.