That's an old article I wrote some years ago. At the end you can find some links to usability resourses.

http://www.jazz.futurezone.com/usability_english.htm

Cheers.

Ramiro.

Usability in what context? Application design? Product design? Type design? Web design?

GUI mainly.

http://www.boxesandarrows.com/

http://www.upassoc.org/

http://www.webword.com/

http://www.humanfactors.com/

http://www.firstmonday.org/

http://www.stcsig.org/usability/newsletter/index.html

http://www.usabilitynews.com/

http://www.useit.com/

But cover your eyes. Jakob has always interesting points but in my opinion is a poor designer. I mean the web isn't print, there's no excuse, what you see on the screen is what others will see too. Ah well. Use a browser like Lynx :)

http://rosendorf.us/blogdorf/archive/2004/12/15/147.aspx

"Good web design means that you don't have to user test"
Edward Tufte on user testing and analytical design.

Listed below are a few usability websites out of my bookmarks. Hope you find them useful.

Usability Expert Jakob Nielsen's website:
http://www.useit.com/

Usability Expert Bruce Tognazzini's website:
http://www.asktog.com/

Outdated but nevertheless comprehensive database of some very useful websites on user interface design and information architecture:
http://www.usableweb.com/

An association for Usability professionals worldwide. You'll need membership but I say its worth it.
http://www.upassoc.org/

Resource for techniques on usability testing and heuristic evaluation:
http://jthom.best.vwh.net/usability/

An HCI (human computer interaction) portal:
http://www.hcibib.org/

Resources for user interface design
http://gui-designers.co.uk/resources/resources.htm

A very useful (and well designed too!) webzine on UI design:
http://www.uigarden.net/english/

Thanks guys, these will prove to be very helpful.