Software

Adobe Acrobat - http://www.adobe.com/products/acrobat/
Adobe Illustrator - http://www.adobe.com/products/illustrator/
Adobe Indesign - http://www.adobe.com/products/indesign/
Adobe Photoshop - http://www.adobe.com/products/photoshop/family/
QuarkXpress - http://www.quark.com/
Microsoft Publisher - http://office.microsoft.com/en-us/publisher/

Fonts / Color

Adobe - http://www.adobe.com/type/
Artistic fonts - http://simplythebest.net/fonts/
Fonts - http://www.fonts.com/
Pantone - http://www.pantone.com/pages/pantone/index.aspx

Graphic Design & Desktop Publishing

Design / Publishing - http://desktoppub.about.com/od/professional/f/gd_vs_dtp.htm
Desktop Publishing - http://desktoppub.about.com/
Graphic Design - http://desktoppub.about.com/od/graphicdesign/Graphic_Design_Tutorials.htm

Publications

Before & After - http://www.bamagazine.com/
Communications Arts - http://www.commarts.com/
Computer Arts - http://www.computerarts.co.uk/
HOW Design - http://www.howdesign.com/GeneralMenu/
I.D. Magazine - http://www.id-mag.com/GeneralMenu/
Print - http://www.printmag.com/

Stock Photography

Dreamstime - http://www.dreamstime.com/
iStock - http://www.istockphoto.com/
Shutterstock - http://www.shutterstock.com/
Stockvault - http://www.stockvault.net/