Application notes from Faran.
http://www.farran.com/index.php?sc=4
Application Notes by category of product, mostly analog.
http://www.maxim-ic.com/TechSupport/support.htm
From AVX corporation. Notes on capacitors (all types), ceramic resonator, decoupling and the theory and uses of capacitors.
http://www.avxcorp.com/TechInfo_catlisting.asp
Technical support including application notes and data sheets on some very interesting products.
http://dbserv.maxim-ic.com/solutions_start.cfm
Almost all anyway. You will find an extensive list of data sheets for chips, transistors, diodes and everything else here.
http://www.bgs.nu/sdw/
Listing of nearly all of Intel's application notes, technical literature. Nearly complete document center.
http://developer.intel.com/design/litcentr/index.htm
Design notes extensive list of very good analog circuitry notes.
http://www.linear-tech.com/pub/
Power design page, components, and selection guides.
http://www.national.com/appinfo/power/