Pinterest is by far my favorite. So many different cool ideas...Fitness pages, art, home decor, clothes and accessories, hair and makeup tutorials, crafts, kids stuff, cooking and baking...I love it. I feel like it HAS improved my life in ways. I have already made a few neat crafts from ideas I found on there. I have finally figured out how to make my girl's hair look cute (I was clueless before). Have made some very tasty treats and meals. Learned how to crochet this week and taught the kids how to do it- we are all making scarves now.
I like Etsy.com which is a handmade items site. I get lots of great craft and art inspiration from there. Finally this year I have started drawing and painting again!
Ourbestbites.com is my favorite recipe site, everything I have made has been so tasty and they have a lot of great tutorials.
Allrecipes.com- you don't need a cookbook if you have access to that site. I love that you can pretty much find a recipe for ANYTHING there and there are user ratings and tips so you know if it is going to turn out well or not.