In the UK there is the EPSRC Vacation Bursary Scheme for undergraduates, which provides funding for students to undertake an individual research project under the supervision of a suitable advisor during the summer.  I participated as an undergrad myself and found it to be a really good experience.  As I understand it, the universities participating in the scheme deal with the organization, but there is some information available at the [EPSRC website][1]


  [1]: http://www.epsrc.ac.uk/funding/students/Pages/vacationbursaries.aspx