Hopefully, I've successfully attached a Microsoft Excel (ETA: Word document) file below of the blank Copic Color Chart I use (shown in the post below) -- thanks to Marianne at Copic! This blank chart is for you to color in with the markers you have, so you can easily reference it. If you have any problems downloading the chart, just leave a comment on this post and I'll try getting it to you in another way!
Edited to add: I've had some good questions from readers, so I thought I'd share this additional information. You probably want to print the chart on either Georgia Pacific (from WalMart) white, Papertrey Ink's white, or Neenah Classic Crest white . . . basically any cardstock that has been found to work well with the Copics and that you would normally use with your Copic artwork, so you get the truest representation of the colors. Usually, the printer ink won't smear with the Copics.
Some of you have asked about the Copic Certification class I attended in January. Copic now has a list of their upcoming certification classes posted on their website here!
ETA Word document: Download copic_marker_color_chartsharon_harnist.doc