What psychophysical research published its data? Can you point to published research in psychophysics that made its original* data available? 

*by 'original' I mean the trial-by-trial responses for each subject, and not some kind of aggregate that is usually reported (such as overall percent correct for each condition, or even each stimulus pair). 

I am specifically interested in discrimination studies, using 2-alternative-forced-choice design, but any other psychophysical work is also welcome.

I'm aware of this great question and went over its answers when looking for data. It seems the published data in those datasets is mostly social science, "soft" psychological data and imaging data, and I found only few psychophysical studies, none of them involving discrimination tasks.
It's not exactly what you're after, but the Newcastle Cognition Lab has a data repository. It includes a number of learning curve datasets and other studies that measured response time to various simple cognitive tasks.