I recently discovered
Tricky Truck, thanks to RyLe, and I was stunned by the look of the shadows in this game.
It seems that it renders shadows from multiples positions around the light and blends it, creating a nice, smooth, "ambient occlusion" styled result.
It tried very quickly to write a small patch (currently < 50 lines) to see if it's possible to have this type of rendering, and here's the result of the first experimentation:
http://ftp.cqfd-corp.org/too-slow-to-stay-shadows.jpg (sorry, too lazy to create a thumbnail for the picture).
This is (way) not quite as good (at all) as the original, but I like the way it looks
This is just a try, since the current way to do this requires a lot of pass to render the ground and it completely kills the framerate. This is only brute-forcing
I'll try to push experimentations a bit further.