This collection of URL's, along with a really good magnifying glass, will go a long way in helping you identify the myriad of manufacturers' logos one encounters on those tiny electronic parts.
The one I goto first is Quick reference for common manufacturer logos on electronic components from the Electronics Point website.
Embeddedlinks.com has some oldies but goodies. Kudos to them for keeping the site up even though it says it was last updated July 11th, 2003!
www.plasma-online.de has a comprehensive collection as well. I like the fact that it's indexed alphabetically, and thus easy to thumb through. Minor de-merit for the hard-to-read black background.
And be sure to check out:
