DataCite.org is the DOI Registration Agency for data sets. Lots of people use it to store, make available and make citable data sets and (AFAIK), code. FigShar

DataCite.org is the DOI Registration Agency for data sets. Lots of people use it to store, make available and make citable data sets and (AFAIK), code. FigShare.com is a DataCite member that has a nice interface for uploading and giving DOIs to research content.