Great site for purchasing vector art! A little expensive but a lot of work goes into these illustrations, so it's all worth it!!!
Another site for purchasing vector art. It has a little less choice than istockphoto but is less expensive!
Entrecard is a nice site for discovering new blogs on any topic and also for receiving visitors to your own blog!
Listen to practically any music online. It has some useful tools as well like finding similar music. It's perfect for when I'm working on a blog design!!!