Endangered Fish Recovery Programs Improvement Act of 2008 - Amends federal law providing funding to continue endangered fish recovery implementation programs for the Upper Colorado and San Juan River Basins by: (1) modifying the definition of "capital projects" to include rehabilitation and repair of facilities; (2) modifying the definition of "facilities" to include facilities for protection of critical habitat and for preventing entrainment of fish in water diversions; (3) increasing funding; and (4) extending the authorization period to fund recovery programs.