Kuler, the brand new colour tool from Adobe Labs, is awesome.

It's built in flash and has a community where you can share your schemes.

However, the most impressive part of this site (apart from it being built totally in flash), is the ability to create a complete colour scheme using only one colour. You can choose from 6 rules (I've also listed Adobe's descriptions for each one):

• Analogous: Match colours with adjacent hues.
  
• Monochromatic: Focus on one colour with varied intensity and lightness in a single hue.
  
• Triad: Space your colours in a triangle around the wheel for a contrasting theme.
  
• Complementary: Oppose two colours on the wheel for a simple theme based on two hues.
  
• Compound: Combine interesting colours from multiple hues.
  
• Shades: Create subtle variations of the base colour's hue.

There is also of course the option to customise all the colours yourself, but for someone like myself who really struggles with creating nice colour schemes, this tool is fabulous!

You must have an Adobe ID to use this tool, but its free to sign up.

Big thanks to former Cyfle trainee Mei for blogging about this.