www.adafruit.com

Adafruit Industries, Unique & fun DIY electronics and kits and their blog on electronics, open source hardware, hacking and more...

www.rs-online.com/designspark/electronics/

The gateway to online resources and design support for engineers, powered by RS

Electronic Design Engineers community, free design tools and resources. Download free development tools including component library files, CAD tools & 3D Models ...

www.eevblog.com

An excellent electronics forum and blog. It is very busy and covers all skill levels, but do use the search feature.

octopart.com

Octopart is a search engine for electronic parts. Search across hundreds of distributors and thousands of manufacturers. Search  ...