Go to your current employer and ask to be called in as a contingency worker. Larger organizations have pools set up for retirees to be on call or kept on as consultants, still maintaining benefits. Start as a volunteer create your own paid job by proving your worth or developing a new need for the organization. Go back to school wither as a teacher or as a student. Teach library science, research, Internet access, word processing, knitting, etc.
Librarians are fast track students.
You can do this as an entrepreneur or through a service like CBG . Also try information brokering or become a legal advocate. Work for a staffing firm the general firms are begging for workers. They will make good use of any office or supervisory skills you may have. This can lead to regular part-time permanent work.