And here are some helpful links
Rockridge Manor: http://www.rockridgemanor.co.za/
Campsites in the KTP on the SA side: http://www.sanparks.org
Campsites on the Botswana side booked through http://botswanaselfdrive4x4.com/botswana.htm (they do charge a hefty $100 commission for this service + additional fee for courier delivery of the papers, and there are alternative ways of booking hassle-free and for free (except for the courier of course), but they got me out of a pickle in 2010 & the least I could do is book through them this time). Campsites used in the Botswana side of the KTP are still owned by DWNP and can also be booked by following the contacts on this page: http://www.mewt.gov.bw/DWNP/
Van Zylsrus: http://www.vanzylsrushotel.com/
Phuduhudu Lodge: http://www.lobatseaccommodation.co.za/p/298365/lobatse-accommodation
Other Information + GPS Maps
Tracks4Africa: http://tracks4africa.co.za/ - the best GPS maps to use on a self-drive safari, with all campsites and park tracks included. However, parks in South Africa have very good maps that be downloaded from the SanParks website, and a GPS is usually not required.
4×4 Community ZA Forum : http://4x4community.co.za/forum/ - the best resource on the internet for up to date information about self-driving in Africa. This forum really rocks!
SanParks forum: http://www.sanparks.org/forums/ - lots of helpful info about the SA side of the KTP. More oriented towards the animal sightings.