I second www.instructables.com. Don't forget www.adafruit.com but where I have really found what I need is simply google. If you know what you are looking for just use proper search terms and typically there is someone who has already done at least a portion of what I am working on.
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[ 2.5 ms ] story [ 11.4 ms ] thread- http://hackaday.com/ : general and also arduino based hardware hacking
- http://makeprojects.com/ : great books & resources
- http://www.instructables.com/ : projects (some based on arduino)
- http://arduino.cc/forum/ : the arduino official forum
get off the internet and build things
Kinda plain, but works well in my feed reader.