The makers of Mailbrew have crafted yet another great product. This time it's a tool called Feeds Mage, that scans your Twitter follows and unearthes any blogs, newsletters, YouTube channels, etc. that might have previously gone unnoticed. And then from there, you can even create a regular email digest from these sources.
I ran this on my own Twitter account, and it found 149 feeds in total. Some were YouTube channels that I already subscribe to, or blogs that I already subscribe to via RSS feeds. But I did manage to find 11 more blogs that I've now added to my RSS reader!