If you're in search of LiDAR data, I recently heard of a couple of sites that may be of use. The OpenTopography Portal is a useful site produced by the GEON Project. Here is information about the OpenTopograghy Portal from the site:
The OpenTopography Portal is a GEON Project initiative to build an online system that provides integrated access to high-resolution topographic data, web-based processing tools, and enables the user community to share knowledge, experiences and resources. ... If you have data you’d like to share, resources such as tools or documents to contribute, or are interested in collaborating, please contact us.
Our goal is to use the OpenTopography Portal as a way to democratize access to high resolution topographic data and to allow users to share resources and knowledge.
Thanks to Dave Tewksbury of Hamilton College and Peter Lea of Bowdoin College for posting about these sites.