The Last Frontier Four Wheelers.  Anchorage based four wheel drive club.
Arctic Offroad is a four wheel drive club based near Fairbanks, AK.
Alaska 4x4 Network  A great resource for tech. information, trail information, and networking with other four wheel drive enthusiast all around the state.
Wheeling Adventures  This page has lots of pictures and movies of four wheeling in Alaska, as well as other locations.  Some tech, and place for readers to upload information about their rig, and a very well laid out message board with handy functions.
JeepAlaska.com. A number of good pictures and video on Jeepin' it in Alaska.
Old Club web page 2.  Same as above, but had more pictures for the taking.
2 Broke 2 Play. Mat-Su Off-road Club.