I am doing a presentation on the topic of online research tools at the annual meeting of the Western (US) Psychological Association in April, where I will be including information on LimeSurvey. I'm also presenting results from my master's thesis, which was a big success due in no small part to LimeSurvey's Assessments capability.
I am a doctoral student at Claremont Graduate University in California, and I know of several other students in our department successfully using LS for their theses and dissertations.
I'm with the University of Illinois in Chicago at one of the psychiatry department research programs, and we're currently investigating the use of LimeSurvey for several of our studies regarding mental health issues affecting sexual minority youth.
I work at Maastricht University in the Netherlands, and I use LimeSurvey (and am advising anybody who asks me to use LimeSurvey ). Not hosted at the university here though - they only support ASP