This area is about 60-90 minutes (depending on traffic) NE from Phnom Penh. It's apparently about an equal distance W from Kampong Cham. The cliff comes into the sun about 11am (at least in July when we were there) and once it does, it's really hot. Leave very early from Phnom Penh to enjoy shady climbing.
The crag is comprised of gigantic boulder type formations. There are Fixe glue in anchors on top of almost all the routes. A 60 meter rope, some slings and carabiners, and if you want to lead, six or so draws will get you up most routes.
There is a guidebook, Rock Climbing in Cambodia (2007) that details the routes. The guide is currently available from Chessler Books. There is also a website (www.rockclimbingincambodia.com) but it doesn't seem to be too active.
There are local kids who will come up to see what you are doing. They are friendly and love to climb. Take the time to give them a TR on one of the easier routes. When we were there, they brought a machete type implement and chopped back the vegetation at the base of the routes for us. We gave them a bit of money for their efforts.
All in all, it was worth hauling our climbing gear to Cambodia to have a day on the crag!