More Resources on SURF & GPU

SURF C++ Implementations
OpenSURF: http://www.chrisevansdev.com/computer-vision-opensurf.html
OpenCV SURF: http://opencv.itseez.com/modules/gpu/doc/feature_detection_and_description.html

SURF GPU Implementations
Speeded Up SURF: http://asrl.utias.utoronto.ca/code/gpusurf/
CUDA SURF: http://www.d2.mpi-inf.mpg.de/surf?q=surf
GPU SURF: http://homes.esat.kuleuven.be/~ncorneli/gpusurf/

Reference
http://en.wikipedia.org/wiki/SURF