Fast Company is great because they usually profile 5 folks per issue around some theme. Mostly senior manager to director level folks so you get a better insight into the working of companies. Also a really nicely designed mag.

The Inc. 500 is useful in that they publish revenue numbers of companies in a wide variety of industries. I've found it very useful when assembling presentations of comps.

Also, you can get subscriptions to both magazines for free ($5 max) with various offers online.

I'll second Inc. and Fast Company. Both have great content.

For an outside the tech mag, I'm a huge fan of GOOD (http://good.is). Lots of smart thinking and and in-depth explorations of the theme for each issue.

I second Inc. They have some good articles and much of the content is relevant to internet startups

Inc. is great, inspiring and tons of useful stuff. Fast Company is good, too full of cultural and art stuff, very similar to Wired. Entrepreneur is for fast food franchisees and ebay businesses, really not much for tech startups.