Forums

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• EDAboard - Good and very active forum with lots of helpful members
• Stack Overflow - Software questions get answered here really fast, also has a big pool of answered questions.

Electronics

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• Designer's Guide - Great site with lots of resources for IC design and Cadence usage. Also has a great forum
• Sparkfun
• Hackaday
• Talking Electronics

Theory

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• Good reference for RF design
• Epanorama - Site with lots of circuits and resources

Simulation

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• Ecircuit Center - Great site for SPICE tips and circuits

Components

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• Digikey - Great site to find and buy components and compare pricing for parts
• Octopart
• Avnet
• Solar Panels - Great place to buy solar panels
• Plastecs - Cheap solar cells and panels
• Look up top markings

Magazines

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• EDN - Great Design ideas, articles and blogs
• EETimes
• Unitrode Seminars - Great collection of articles for switch mode power supplies

Hardware

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• Great reference for materials and their properties

Software

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• MIT Fast Field Solvers

Open Source

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• Sourceforge
• Google Code - This has open source hardware and software projects

Shopping

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• Deal Extreme