Pinterest. It's been blogged and tweeted ad nauseum but that's because it's so freaking useful. Especially for those who are bringing a vision to life -- whether you are planning a party, redecorating your home, or strategizing about your new fall wardrobe.
For more snippets of inspiration check out what I'm pinning here. I find it a nice complement to this blog as it allows me to capture ideas in almost a "pre-" phase before they become true ideas, fully gelled.