NRCS CAD Standard
strongtie.com - Metal Hanger Drawings
subwaytile.com/CAD_DL.shtml - Subway Tiles Only
windowsymbols.com Anderson Windows - lets you download plan and elevations of windows and doors through the web. They also have a downloadable stand alone program Window Studio which allows you to create windows for use in CAD and Google SketchUp on your computer.
If you know of anymore websites, please e-mail me or leave a comment. Thanks!
See AutoCAD Tips for more.