In case people missed it, here is a video of 2 (of many) reverse thrust landings that Tom Pettenger showed off at the recent Developer un-conference in Canberra Australia.
Instructions on setting up reverse-thrust landings are here on the wiki but in short, it requires a motor that can spin backwards and also having a folding prop is good so that it is not damaged during landings.
Reverse thrust landings allow much more accurate landings because the vehicle has better control of its glide slope.
The landings in this video were quite dramatic because the desired glide slope was set to 45 degrees, much more conservative landings are possible of course.
Also Tom says the porpoising at the end is something he’s working on getting rid of. It’s a tuning issue apparently.