There are many good recorded webinars on LiDAR and GIS topics through GIS user groups in the Northeast US.
One is through the Vermont Center for Geographic Information. They have recorded webinars in Windows Media Player format and periodic live webinars.
Another source is the Spatial Analysis Laboratory trough the University of Vermont. They most recently have posted a few Youtube videos on working with LiDAR data.
Finally there is the New England Chapter of the Urban and Regional Systems Association (NEURISA). They have periodic events with recorded and live webinars currently open to anyone who wants to participate.