This study is from the Journal of Nutrition:
The abstract is there to read. Basically the subjects were normal weight women, they had two trial days. Matched isocaloric intake of sucrose vs. HFCS that was 30% of intake. The second day was ad libitum (as much as you want) access to food after fed HFCS or sucrose, which again was 30% of the meal. They tested all the plasma levels (insulin, ghrelin, etc) and saw no sig difference between the groups.
I know this is preliminary and it doesn't give an excuse to just eat tons of HFCS, but it's interesting nevertheless.