Published in 2007 by ARLIS/NA (Art and Research Libraries of North America) and still relevant today.
Page 12, 23 and 32 include basic, intermediate, and advanced competencies for students in all design disciplines.

Adobe offers a product help and support site for each of its products. Select a product (Illustrator, InDesign, Flash, etc.) either from the icons shown or from the dropdown list to view a help and support page containing articles, tutorials, videos, blogs, highlights, and more for that product.

The Adobe Video Workshop site provides video tutorials and demos on Adobe products. Narrow a search by product or topic and view details about the video such as presenter, topics covered in the video and the level of difficulty.

Quark offers information and training videos for its newest products on its site under Learn More. Other useful sites and blogs providing tutorials, exercises, and design forums can be found under Communities.

"AIGA, the professional association for design, is the place design professionals turn to first to exchange ideas and information, participate in critical analysis and research and advance education and ethical practice."

Also see: AIGA Design Archives

The Color Marketing Group "is a premier international association for color design professionals. Their mission is to create color forecast information for professionals who design and market color."

Icograda is the world body for professional communication design. The Galeria is especially noteworthy as it features designs from graphic artists around the world.

"is the global community of people who work at the intersection of communication design and the built environment."

"A national union of illustrators, designers, web creators, production artists, surface designers and other creatives who have come together to pursue common goals, share their experience, raise industry standards, and improve the ability of visual creators to achieve satisfying and rewarding careers."

From Duke University Libraries' Digital Collections.
"Over 7,000 U.S. and Canadian advertisements covering five product categories - Beauty and Hygiene, Radio, Television, Transportation, and World War II propaganda - dated between 1911 and 1955." Primarily consumer ads from popular magazines and newspapers.

Some information is free. Covers ad agencies and campaigns, award shows, etc. worldwide.

Find fonts based on similarity, characteristics, font name, or designer. The site offers a variety of free fonts as well as fonts that are available to purchase.

"is a bimonthly magazine about visual culture and design. Covering a field as broad as communication itself, PRINT documents and critiques commercial, social, and environmental design from every angle."

"is all about the exchange of information, news, reviews, and all things revolving around the broad topics of design and publishing. Here you will find all kinds of resources relating to graphics, layout, design and typography. We'll always be on the look-out for better ways of communicating with less cost and less bother."

The Design Museum, London, site has a list of designers and groups. Some (but not all) of the groups and designers are involved in graphic design.

The Research Guides provide links to biographical information on designers, as well as to a number of journal digitization projects in art, architecture, design and crafts (coverage is from inception to 1922)

Graphic designer David Airey has compiled a list of the "top 50+ graphic design blogs." Check out these blog titles: I Love Typography; Subtraction 7.0; You the Designer; Logo Design Love; Grain Edit; Swiss Legacy; Just Creative Design; Creative Bits.