I visit 3 other groups regularly:
Land Rover Owner International -
Land Rover Enthusiast -
Plus this one and I've also found
ezboard Offroaders Rant Page - http://pub88.ezboard.com/boffroaderrantpage
alt.fan.landrover probably has the widest membership, and the LROI is probably the most focussed - all seem to have a lot of knowledgable and friendly people.
Hope that helps - the more good sites the better - this one looks really promising! Good luck