Old question that appears to have never been answered: Dark skies. Really dark skies. No moon. No city lights. Focus can be challenging, so shoot with a high quality, wide-angle lens set to wide-open aperture and to infinity, if possible (unless you need to focus on something close). I've gotten lots of stars with a 30-second exposure and ISO 800 (higher ISOs make for grainier pictures). I've even gotten a few stars with a modest digital P&S and a 10-second exposure. The real key is those super dark skies.
That's the claws and abdomen of Scorpius rising above the tent. There's a lot of the Milky Way in that part of the sky. You can see it in my own similar image here (it shows the tail of Scorpius, and adjacent Sagittarius).