As a quick update for those who haven't noticed, the CSTheory blog is being only irregularly aggregated by the TOC blog aggregator. For example, my post two posts ago was aggregated, but the current post was not. Arvind over at the TOC aggregator has done as much as he can about this problem, including trying to use different blog feeds, and taking a look at the aggregator code (which he did not write). For comparison, 100% of the posts on my personal blog have been aggregated, during the same time period.
The problem does not appear to be the validity of the RSS feed, though the current post is generating warnings that I am not sure how to fix. My best guess at this point is that MathJax is the problem, because the math-free posts seem to aggregate, but the posts containing math often don't. So, ironically, the posts with the most TCS content are the least likely to be seen by TCS people.
Joe and I have discussed this. His idea is that we could run our blog feed through a feedburner, see if that cleans up the feed, and then perhaps send the feedburner's feed to the blog aggregator instead of StackExchange's feed. I have dug into the RSS feed after every blog post and tweak things, so my "blog time" over the last couple months has gone into talking to (potential) contributors, and messing with the feed, instead of generating TCS content of my own. I've also put up posts on my own blog to direct traffic to the CSTheory blog, because I know my own blog is aggregated. That is a kluge, though, and I've decided not to do it anymore.
We will keep you posted.