The combined RSS feed is not correctly including blogs on Blogger or Blogspot. If your blog is missing from the most recent posts, that is the most likely reason. If you’re not on one of those services and you aren’t showing up, let me know. The best way to check is to look at the aggregator, which lists the last 50 posts. If you have a recent post and it’s not in there, let me know.
I expect to have something working yet today. Unfortunately the wordpress plugin I’ve been using to aggregate has not been updated for some time, so I can’t really check that way. I’ll probably either find another aggregator, or finish up the one I was already writing, but abandoned since there was such an easy option to use a wordpress plugin.