The participating organizations in the first http://sophia.estec.esa.int/socis2011/ has been announced. There are 32 participating organization and each is to be allowed one student.

From the announcement:

For the first edition of SOCIS (2011) we received 32 applications from mentoring organizations. As this first edition of SOCIS is a pilot programme (and thus limited in funding) we preferred to include more organizations than assigning multiple slots. The following 20 organisations have thus been assigned 1 student slot each.

Please visit the ESA SOCIS program site for more information. If you have questions about the program, there is a Google Group for this purpose. Information for students interested in an RTEMS project, should see the information on the RTEMS Project home page.

Reference: SOCIS Selected Organizations