The D minor seventh (also know as Dm7, D-7). The notes include the root, minor third, perfect fifth, minor seventh.
Dm7 (D minor seventh chord)
A great chord vamp that you can use this with is a Dm7, G chord progression. Watch to the video for some ideas:
How Does Dm7 Sound?
What uses have you found with the D minor seventh chord? What are your favorite songs that use this chord?