What SaaS apps have a great UI ?
zarski: Smashing mag. has some good articles on this topic.http://www.smashingmagazine.com/2010/02/25/designing-user-in...http://www.smashingmagazine.com/2009/01/12/10-useful-web-app...I have worked pretty hard on the UI/UX experience for http://simplton.com/screenshots and have been happy with the results.Also, look no further than Google, their interface work with Google Reader and Docs is excellent.