Switching Between CMYK and RGB Color Modes in Adobe Illustrator

In the articles section of iStockphoto.com, I found a great material about using color modes when working with vectors. 

The article explains how to find out what is the color mode that you are currently using (CMYK vs RGB), how to change it and when. If you are not familiar with using color swatches in Adobe Illustrator, you may consider checking it out too. Full Article