Splendide in full sun
I have a Thalictrum "Splendide" which I think does well in a somewhat shady location but after seeing GW member twrosz "Splendide" planted in full sun (see link) I was bowled over as it is a spectacular specimen, I almost immediately went out and quickly planted another one in August 2012, in also a full sun location. So 2013 is its first full year in this situation. Of course it isn't nearly as awesome as twrosz's but it has done just fine with much more sun and I am hopeful it will become fuller and more floriferous in subsequent years.
Here are two shots of this plant in our garden.
Here is a link that might be useful: twrosz's incredible