The Amazing Color Label Wheel
Holy relative percentage positioning! This was built from asking people how they would describe thousands of colors.
One of those headline aggregator style sites (like POPurls) only for just CSS stuff. Hey, CSS-Tricks is on there! Cool.
CSS Frame Generator
Paste your markup into the box and click the button. This site will look at every tag on the page and generate an empty CSS file for you that specifically targets every single element on the page specifically. While this is kind of neat, it's not very practical. You may end up with 15 different places to declare your paragraph tags starting this way, when really you should be keeping our CSS as light and flexible as possible and be declaring as few things as you need to.