There are a large number of videos of land yachts on YouTube.
Recent videos of BFSLYC land sailing events can be found at https://www.youtube.com/user/anglialandsailing 
357 land sailing videos at https://www.youtube.com/playlist?list=PLRShCo5Kc_48q1eDgicMXA5_n2Xy-5dHQ

Photo galleries from sand yachting events can be found at :-
http://www.pbase.com/waltercarels/land_sailing
https://plus.google.com/photos/114299149593435123923/albums/5657123997067049505?banner=pwa&authkey=CN6wp_iAiO223wE