Some examples

insulin for diabetics
factor VIII for males suffering from hemophilia A
factor IX for hemophilia B
human growth hormone (HGH)
erythropoietin (EPO) for treating anemia
several types of interferons
several interleukins
granulocyte-macrophage colony-stimulating factor (GM-CSF) for stimulating the bone marrow after a bone marrow transplant
granulocyte colony-stimulating factor (G-CSF) for stimulating neutrophil production, e.g., after chemotherapy and for mobilizing hematopoietic stem cells from the bone marrow into the blood.
tissue plasminogen activator (TPA) for dissolving blood clots
adenosine deaminase (ADA) for treating some forms of severe combined immunodeficiency (SCID)
parathyroid hormone
several monoclonal antibodies
hepatitis B surface antigen (HBsAg) to vaccinate against the hepatitis B virus
C1 inhibitor (C1INH) used to treat hereditary angioneurotic edema (HANE)

see
http://users.rcn.com/jkimball.ma.ultranet/BiologyPages/R/RecombinantDNA.html