PCB Footprint Guide

• http://www.nxp.com/package
• http://focus.ti.com/general/docs/packaging.jsp
• http://www.maxim-ic.com/design/packaging/
• http://www.national.com/packaging/folders/pkg_index.html
• http://www.irf.com/package/
• http://www.onsemi.com/PowerSolutions/supportTechDoc.do?id=1165
• http://www.analog.com/Analog_Root/Packages/Packages_Home/
• http://www.linear.com/designtools/PkgInfo.jsp

* The place to share symbols and footprints is gedasymbols.org

* You can find many PCB footprints at John Luciani's footprint page

* You can share gEDA footprints at Open Circuits.