Scholarship list:

• Of course first at all, the scholarships for our own Physics and Astronomy department and also the Ohio University scholarships (there are many of them: you SHOULD apply to them).
• July 2012: APS Minority scholarship
  The scholarship is open to any African-American, Hispanic, or Native American US citizen or permanent resident who is majoring or planning to major in physics, and who is a high school senior, college freshman, or sophomore. The application deadline for the 2013-2014 academic year is February 1, 2013. Find more info here.
• March 2012 : SanDisk opens application for new scholarship for undergraduates
  The SanDisk Scholars Fund is a $1 million scholarship program that supports the educational goals of selected students who wish to pursue careers in science, technology, engineering and mathematics (STEM) fields. The SanDisk Scholars Fund will award scholarships of up to $10,000 per student to graduating high school seniors, community-college students, or students already enrolled in a STEM-related course of study who demonstrate a need for financial support in order to reach their academic goals.
• August 2012: Ohio Space grant Consortium
  In an effort to encourage advanced education in STEM (Science, Technology, Engineering, or Mathematics) the Ohio Space Grant Consortium (OSGC) offers financial support through competitively awarded fellowship opportunities. To be considered for a fellowship, students must be citizens of the United States pursuing a graduate degree in a STEM-related discipline at an Ohio member university. Women and underrepresented minorities are especially encouraged to apply. All fellowship recipients are required to propose and initiate a research project or educational activity under the guidance of a faculty mentor during the academic school year.

Summer Internship list (most of them are payed internships):

• July 2012: REU a program of NSF
  This link will take you to the portal that lists all of the many internship offered by NSF. From that page: "NSF funds a large number of research opportunities for undergraduate students through its REU Sites program. An REU Site consists of a group of ten or so undergraduates who work in the research programs of the host institution. Each student is associated with a specific research project, where he/she works closely with the faculty and other researchers. Students are granted stipends and, in many cases, assistance with housing and travel. Undergraduate students supported with NSF funds must be citizens or permanent residents of the United States or its possessions. An REU Site may be at either a US or foreign location." Applications are usually due in January/February. Early applications are encouraged.
• October 2012: SULI a program of the Department of Energy
  This link will take you to the portal that lists all of the many internship offered by DOE. From that page:"The Science Undergraduate Laboratory Internship (SULI) program encourages undergraduate students to pursue science, technology, engineering, and mathematics (STEM) careers by providing research experiences at the Department of Energy (DOE) laboratories. Selected students participate as interns appointed at one of 15 participating DOE laboratories. They perform research, under the guidance of laboratory staff scientists or engineers, on projects supporting the DOE mission."

• a very complete list maintained by APS: here
• NASA internships
• CRESST partnership Summer Undergraduate Intern: Center for Exploration in Space Science and Technology at NASA Goddard Space Flight (GSFC) Center http://cresst.umd.edu/Opportunities/
• The National Institute of Standards and Technology (NIST) Summer Undergraduate Research Fellowship (SURF) program (deadline - February 15, 2012, but February 8, 2012 is internal deadline) http://www.surf.nist.gov/surf2.htm http://surf.boulder.nist.gov/
• Several undergraduate research opportunities in Fermi Lab: https://interns.fnal.gov/
• The American Association of Physicists in Medicine (AAPM) Summer Undergraduate Fellowship Program (deadline - February 1, 2011) http://www.aapm.org/education/SUFP/
• The American Association of Physicists in Medicine (AAPM) Minority Undergraduate Summer Experience Program (MUSE) (deadline - February 8, 2011) http://www.aapm.org/education/MUSE/
• U.S. Department of Homeland Security (DHS) Education and Research Funding Opportunities (deadline – January 5, 2012) http://www.orau.gov/dhseducationprograms
• APS/IBM Research Internship for Undergraduate Women (deadline - February 1, 2012) http://www.aps.org/programs/women/scholarships/ibm/index.cfm
• Research Internships in Science and Engineering Program U.S. student and faculty researchers have a unique opportunity to participate in a prestigious international research opportunity. Research locations include top national laboratories, federal research centers, academic research institutes, and private R&D laboratories in India. http://rise.orau.org/
• HARP REU Program: High Performance Computing Applications (deadline - February 15, 2011) http://sites.google.com/site/harpreuprogram/