I know I just did a blogroll update on the 31st of Jan but no sooner than I posted it I learned of a new site called 'simply capitalism' which I recommend.
I'm also adding another science site 'Climate Audit' hosted by Steve McIntyre. Mr. McIntyre gained fame when he and Ross McKitrick exposed the nonsense that was the 'hockey stick' that the IPCC used to show unprecedented warming. This site is for those who like the nitty gritty of climate science.
Update Feb 11th 09:
I'm have trbl keeping up with new blogs. I just learned that the Ayn Rand Center now has its own blog "Voices for Reason" and it should have postings from an Objectivist perspective every day.