I'm using it to execute avisynth scripts in multiAVCHD, to generate subtitle PNGs (from avisynth scripts) in goSUP and multiAVCHD.
Before I was using x264 to execute scripts, but avsinfo is faster, since it doesn't do frame-lookahead, loads quickly, doesn't need YV12 colorspace conversion and uses less memory and is just 50kb.
Dean