The NTSB released the public docket for Flight 1549 on June 9, 2009. The docket contains a wealth of information that can be utilized in a full 3D reconstruction of the accident. K3 Resources, a Denver-based company that specializes in technical animation and accident reconstruction, did this video as a marketing project but reportedly got engrossed in the whole effort and invested some 200 hours in it. They say, "Integrating all spatial and temporal data allows us to approach this accident from a never-before-seen perspective." That's for sure. The video is a bit over seven minutes and spans the entire flight time of Flight 1549. There are also numerous other resources on this page, including radar images on which you can make out the bird clusters.
Well worth watching.