I agree that the majority of Pilot's have decent tasting coffee. Some TA's and some Flying J's have pretty decent coffee in the stores.
For just plain good coffee though, I like Seattles Best coffee,
http://www.seattlesbest.com/
and Tullys coffee,
http://www.tullys.com/
Both put out a smooth brand of coffee. I like to just make straight up coffee with their grounds, instead of espresso, latte`s and cappuccino's.
Had some fresh coffee from Columbia last year....very tasty stuff. Had some coffee fresh from Brazil this year...good stuff too.