Barcode Information
Need a barcode for your product but not sure where to start? Try this site:
www.gs1us.org

Want an introduction to how barcoding works?
http://www.howstuffworks.com/upc.htm

Design Software
In order to put together your professional design, you'll need this:
http://www.adobe.com/products/indesign/

Image Libraries
Include a high resolution photo or image in your label. Here are a couple places to look:
www.gettyimages.com
www.liquidlibrary.com
www.istockphoto.com
www.flickr.com

Color
A couple of sites concerning color:
www.pantone.com
www.colormatters.com

Four Color Process Printing
Some background information on process printing (CMYK printing):
http://en.wikipedia.org/wiki/CMYK
http://www.pantone.com/pages/pantone/Pantone.aspx?pg=19890&ca=24