There is more than one artist with the name D1 1.D1 is London based dubstep producer Dwayne Marsh. Son of 90s jungle producer Michael Anthony Marsh.
He first appeared on the Tempa's Allstars Vol. 2 with the track "Crack Bong" in 2004. As of 2008, he has released a series of singles and appeared on many compilations, including Rinse Recordings' 'I Love Dubstep'.
http://myspace.com/d1dj 2. A hip-hop producer (De Uno) who has released 3 albums to date including 'Hip Hop Halloween Haunted House Party'.

Read more about D1 on Last.fm.