Heidegger is one of (if not the) most influential philosopher of the twentieth century, so
there have been several 'return-to-Heidegger!' sort of movements which really plunged into his metaphysical work. (In particular, this notion of 'instrumentality' or 'tool-being' has received a lot of treatment.)
The philosophers involved with the Linguistic Turn are one very good place to go. Derrida, of course, writes a great deal on Heidegger.
As far as serious contemporary work goes, the object-oriented ontology of Graham Harman utilizes Heidegger extensively, and in particular radicalizes the concept of tool-being. I might suggest starting there, as it's really accessible. Zizek writes a little bit on Heidegger, but again that will be true of any serious thinker of the last century with some exceptions (but not that many.)