A collection of essays and pieces from his Magazine, "Liberty", this is, by and large, a fantastic read.
In particular, "State Socialism and Anarchism" is great, and portrays the difference between the statist (US-Liberal) view, and the broader anarchistic view. Many other pieces are also brilliant; for example, his insistence on the many types of family, and his disdain for those who would restrict "family" to one man and one woman, but instead insists on all combinations - a bold stance, undoubtedly, in the 19th Century.
Some of the economics are now outdated (he admits as much, later, when he speaks in favour of political means for trust-busting, so it's not a fault of the author, strictly speaking), but Tucker is an out-and-proud Free-Market Libertarian. And he's also an out-and-proud Anti-Capitalist, and a Socialist.
And I think that's the most important aspect of this book, putting it into today's context - that Market Libertarianism and Socialism are two *complementary* views, not *contradictory* views, no matter what the Randian Libertarians might pretend.
It is they who are a-historical, and have perverted "Libertarianism" to a point where they defend state-intervention on "utilitarian" grounds that it was necessary for the state to enforce the land monopoly, money monopoly, tariffs and patents in order to raise the "standard of living" - a dangerously incorrect view, and one which has handily been done away with many times over, and which is obviously contradictory.
Why only 4 stars? I disagree with his treatment of Kropotkin et al towards the end of the "book", whereby Tucker dismisses his "communistic" version of Anarchism. It's obvious that in reality, many different types of organisation would be tried, and would be successful, and whilst I lean towards markets, I'm not so prescriptive as to write off other methods, and I feel that to do so is self-defeating - and a little mean-spirited ;-)