Check out these various training opportunities:

Christine Mirzayan Science and Technology Policy Graduate Fellowship Program
This graduate fellowship program of the National Academies is an early-career educational and training opportunity designed to engage fellows in the analytical process that informs U.S. science and technology policy. Fellows develop basic skills essential to working or participating in science policy at the federal, state, or local levels. The program takes place in Washington, D.C., from Aug. 27-Nov. 16, 2012.
Application Deadline: May 1, 2012 (references due April 27, 2012)

XSEDE Scholar
XSEDE (Extreme Science and Engineering Discovery Environment) is a collection of integrated digital resources and services. You can apply for a year-long program for U.S. students from underrepresented groups in the area of computational sciences to learn more about high performance computing and XSEDE resources, network with cutting-edge researchers and professional leaders, etc. XSEDE scholars will receive a travel grant to attend the XSEDE12 conference in Chicago (July 15-19, 2012) and participate in at least six online sessions.
Application Deadline: April 30, 2012 (references due April 27, 2012)

Psychology Summer Institute
The American Psychological Association is accepting applications for the 2012 Minority Fellowship Program Psychology Summer Institute, which will take place July 8-14, 2012 in Washington, D.C. The summer institute provides educational, professional development and mentoring experiences to advanced doctoral students of psychology and psychologists who are in the early stage of their careers. Participants are guided toward developing a grant proposal, postdoctoral fellowship, dissertation, treatment program, publication or program evaluation project.
Application deadline: May 1, 2012

Mentoring Researchers in Latino Health Disparities
The Graduate School of Public Health and the Institute for Behavioral and Community Health Services at San Diego State University are accepting applications for a nationwide mentoring program, Investing in America’s Future: Mentoring Researchers in Latino Health Disparities. The purpose of the program, which is scheduled July 20-August 3, 2012 in San Diego, California, is to mentor junior faculty and researchers pursuing research interests in cardiovascular disease in Latino populations and other chronic diseases specific to Latino subgroups.
Application deadline: Submit pre-application online as soon as possible