Elektronik
Aage Nielsen
Vejle RC'S hjemmeside
RS Components A-S
Brinck Elektronik
ELFA -- Distributør af elektronik i Nordeuropa
Farnell InOne.

Circuits, Datasheets
[All About Circuits] Complete guide to Electric Circuits
[All Datasheet] search site for Electronic Components
[EDN] Voice of the Electronics Engineer

Other
The X-Number Way