Mentoring for All Act of 2008

Mentoring for All Act of 2008 - Amends the National and Community Service Act of 1990 to direct the Corporation for National and Community Service to award competitive, matching, three-year grants to nonpartisan, collaborative, public-private partnerships at the state and local level for efforts to grow and strengthen direct-service youth mentoring programs in all forms and settings in their service areas.

Requires partnership grantees to use at least 80% of their grant for competitive subgrants to mentoring programs: (1) operated by or being created by, nonprofit organizations, schools, or local governments; or (2) operated by local collaboratives that each include at least two experienced youth mentoring organizations and at least one entity that provides volunteer mentors. Allows partnership grantees to give subgrant priority to collaboratives.

Requires each partnership grantee to participate in a collaborative national network of mentoring partnerships.

Directs the Corporation to award competitive, matching, three-year grants to entities or collaboratives of entities enabling the entities or collaboratives to: (1) build the necessary infrastructure to create a state mentoring partnership; or (2) implement national mentoring projects.

Requires the Corporation to evaluate this Act's programs and provide training and technical assistance to grant fund recipients that is based on support from the national network of mentoring partnerships.