"Overcoming Barriers: Human mobility and development" is the subtitle of the this year's Human Development Report, published by the United Nations Development Programme (UNDP). The Report demonstrates that migration can enhance human development for the people who move, for destination communities and for those who remain at home.
Full text (pdf, 229 pages):
http://hdr.undp.org/en/media/HDR_2009_EN_Complete.pdfRead more:
http://www.undp.org/hdr2009.shtml