MMScroller is a project mainly written in OBJECTIVE-C and C, it's free.
ios style scroller for Mac
I'm writting a twitter client and want to make a scroller like Twitter. I searched a lot and finally found this post.
It was wrote by DINH Viêt Hoà. The author of Sparrow. A great app. Many thanks to DINH Viêt Hoà.
I changed it a little to fit my project. Then it looks like this: