Some links to component manufactors. Provided for your ease when locating datasheets...
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Allegro
Altera
AMD
Analog Devices
Atmel
AVX
Burr Brown
Chip directory
Cirrus Logic
Cosmo Ferrites Ltd.
Cypress
Dallas
Epcos
Exar
FaradNet, search engine for capacitors
Fujitsu
Harris
Hitachi
Hewlett Packard
Hyundai
IDT
Infineon Technologies
Intel
International Rectifier
ITT
Lattice
Linear Technology
Maxim
Micro Linear
Microchip
Micron
Mitel
Mitsubishi
Motorola, semiconductors
National Semiconductor
NEC
OKI
Passive Components, Components, Advanced Ceramics & Modules or Semiconductors
Power Integrations
Samsung
Semikron
Siemens Semiconductors & Ferrites
SIPEX
SGS-Thomson (ST)
TelCom (Teledyne)
TEMIC
Texas Instruments
Toshiba
WSi
Xicor
Xilinx