Data: Links to a number of data sources for LIDAR, mostly free. Currently oriented towards US data only.
Software: Both free and commercial software for viewing and analyzing LIDAR data files, many of which were new to me. Two programs not on the list, but which have some LIDAR visualization/analysis capabilities, are the MicroDEM terrain analysis GIS and gvSIG through the SEXTANTE plug-in (using some of the capabilities imported over from SAGA GIS).
Educational: Links to presentations and primers on LIDAR basics.