I've read some good ones and some not so good ones. The reason why Tim O'Reilly has some credibility (with me anyway) is that he has taken interesting steps beyond the traditional role of publishers.

The O'Reilly websites are actually useful (and free), contrary to what other publishers have to offer. He has an interesting blog. He is able to pay other bloggers for their work. He's experimenting with different formats and revenue models (Safari bookshelf) to make interesting content available.

Trying new things and making a living off them is awesome. That's why I like to hear his opinion on these matters.