The first one (which is actually last on the list, go figure) is Alexander Mariott's Wit and Wisdom, which I find very enjoyable. It appears that he doesn't post every day, but what he does post is very well-written. Alexander actually showed up and commented on my Thomas Paine post, where I growled at him in a friendly fashion. I have a tendency to do that; I even (mildly) smarted off at Peter Schwartz in a forum before I realized who he was.
Anyway, the second blog, which contains more frequent posts, but shorter ones, is The Simplest Thing. The title comes from a Leonard Peikoff quote that I love; I'll give the full thing here:
"All things excellent," said Spinoza, "are as difficult as they are rare." Since human values are not automatic, his statement is undeniable.
In another respect, however--and this is Ayn Rand's unique perspective--the task ahead is not difficult.
To save the world is the simplest thing in the world.
All one has to do is think.