2002 User-Friendly Handbook for Project Evaluation. It is very thorough and detailed but simple to follow.
American Evaluation Association
Assessment, Evaluation and Research--ERIC clearinghouse:
DHHS Planning & Evaluation office
Basic Guide to Program Evaluation
Center for Disease Control Evaluation page
Community-Based Program Evaluation Guide
Evaluation Handbook (W. W. Kellogg Foundation)
Evaluation Cookbook - a practical guide to evaluation methods
Evaluation of Organizations:
Harvard Evaluation Exchange—published 3-4 times a year
ICAAP - resources for methods in evaluation and social research
Innonet - national nonprofit dedicated to building the evaluation capacity of nonprofits, so they can better serve their communities
Logic Model Development Guide (W. W. Kellogg Foundation)
Program Development & Evaluation
Project Star -resources for developing evaluation methods for your program
Taking Stock—evaluating your own programs
United Way Outcome Measurement Resource Library