Some of these are free links, some are paid links. Enjoy your browsing.
www.diydata.com/projects/plans/tool_plans.php
www.ag.ndsu.nodak.edu/abeng/plans
www.woodworkersworkshop.com/resources/index.php
www.abetterbackyard.net/freeshedplans.html
thewinfieldcollection.com/freepatterns.aspx
www.drillbitsplus.com/free_woodworking_plans.html
www.deckplans.com/plans/index.cfm
www.contrib.andrew.cmu.edu/~flip/plans.html
www.woodzone.com/plans/free_wood-plans.htm
www.woodworking-news.com/free_woodworking_plans.shtml
www.swingplans.com/bird_house.html
www.woodworkweb.com/woodwork/downloads.html
woodworking.about.com/od/woodworkingplansdesigns/Free_Woodworking_Plans_and_Designs.htm
www.allwoodwork.com/freeplans/freeshopplans.htm
www.woodcentral.com/links/links.shtml