Here are some nifty sites whose RSS feeds I’ve added to my Google Portal:
Interesting Thing of the Day – a daily article on some interesting thing for the culturally-inspired (or challenged).
Wired – one of the first online culture mags, they will occasional feature interesting commentary — if you can filter out all the nonsense.
Capitalism Magazine: a collection of conservative editorials and ARI press releases, this is a good survey of capitalist and Objectivist writing.
The Egosphere – last but not least is my own metablog, which features posts and articles from about a dozen Objectivist bloggers, including yours truly.