Discovery Communications, LLC (aka the Discovery Channel) has let about 30 people go at its Investigation Discovery, Military Channel, and Science Channel, we hear (and BloggerNews.net confirms).

The company also reported its 3rd quarter results this week of profit of $95 million, a slide from $134 million in 3rd quarter 2008, hurt not by lower ad revenues but by higher costs.

We reached out to a DSC spokeswoman for comment, and we will update this post if/when we hear back.