by Chiara Consiglio
Luke Wroblewski 
is one of the most important user interface designers around today (He is currently the Principal Designer of Yahoo! Inc. 's Social Media group and and Principal of LukeW Interface Designs ).
Surfing the web, i found an interesting list made up by him about some software tools available for user experience professionals: they can help a lot to understand some problems related to interaction and usability and to build up some user related web applications and web site interfaces.
It could also be very useful to browse his company's web site to find some important guidelines for good and effective web site design:
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