Here are some of my favourite showcases of design ranging from business cards to product design:

Business Cards
http://acrisdesign.com/2010/07/70-beautiful-vector-business-cards/
http://bestdesignoptions.com/?p=7264
http://webdesignledger.com/inspiration/20-clean-white-letterpress-business-cards
http://www.instantshift.com/2010/09/22/30-creative-business-card-designs-for-inspiration/
http://www.denbagus.net/best-designs-for-the-business-card-printing/
http://www.webdesigncore.com/2010/10/11/most-bizarre-and-creative-business-card/

Brochures
http://blog.brochuresprintingonline.com/smart-design/24-vintage-brochure-design-examples/
http://www.1stwebdesigner.com/inspiration/brochure-designing-tips-tutorials/
http://www.dzinepress.com/2010/08/call-to-action-brochure-designing/
http://www.smashingshare.com/2010/08/26/50-fierce-fashion-brochure-design-examples/
http://vandelaydesign.com/blog/galleries/brochure-design/

Logos
http://www.tripwiremagazine.com/2009/12/170-excellent-fresh-logos-inspirational-showcase.html
http://www.instantshift.com/2009/11/20/logo-design-inspiration-61-awesome-fresh-designs/
http://www.themeflash.com/58-newly-created-logo-desing-inspiration/
http://designm.ag/inspiration/creative-logos/
http://www.markedlines.com/logo-design-inspiration-for-everything/
http://www.instantshift.com/2010/08/31/70-latest-and-creative-logo-designs-for-design-inspiration/
http://www.problogdesign.com/inspiration/45-creative-logo-designs-for-inspiration/
http://www.wsblogz.com/inspiration/40-stunning-colorful-logo-design-for-inspiration-2/
http://www.freelancereview.net/50-clever-and-cool-logos/

Infographics
http://line25.com/wp-content/uploads/2010/infographic/demo/index.html
http://www.noupe.com/how-tos/creative-examples-of-infographics.html

Presentations
http://noteandpoint.com/

Letterheads
http://www.letterheady.com/

Packaging
http://www.onextrapixel.com/2010/08/13/35-unique-interesting-product-packaging-designs
http://www.graphicdesignblog.org/tempting-package-designs/

Folders
http://blog.uprinting.com/20-professional-presentation-folder-designs/
http://blog.uprinting.com/12-fantastic-pocket-file-folders/

Reports
http://www.freelancereview.net/20-uniquely-creative-annual-report-designs

Typography
http://www.1stwebdesigner.com/inspiration/awesome-typography-examples/
http://blog.uprinting.com/90-exciting-typography-posters-and-designs/

Advertising (photos)
http://www.presidiacreative.com/really-cool-advertisements-and-photomanipulations/
http://blogof.francescomugnai.com/2010/10/food-for-thought-creative-food-advertising/

E-shots/newsletters
http://spyrestudios.com/showcase-of-email-newsletter-designs/

Minimalism
http://www.minimalistdesign.org/

Outdoor Environment
http://www.tutoriallounge.com/2009/11/55-creative-street-ideas-for-better-inspirations/