Engineering Design Standards - L'escargot
This could have a motoring related interest, especially the information on screw threads. tinyurl.com/3asr3y
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L\'escargot.
Engineering Design Standards - Garethj
Most component manufacturers have design guides on their websites, but it's handy to have them all in one place, thanks!

Gareth
Engineering Design Standards - colino
I now know I need to get out more - I found that site really interesting.
Engineering Design Standards - ForumNeedsModerating
Fascinating - very good find.
Engineering Design Standards - daiking
good ole efunda.

I also find www.roymech.co.uk very useful - not so pretty to look at and note the disclaimer but its seemed pretty good for anything I've needed - mech engineer by trade