Romo's Free Software
OFFT, "Outrageously Fast Fortran Transpose", and BFFFT, "Blazingly Fast FFT, 2-Dimensional Vectorized Fast Fourier Transform" written in Fortran 90.
http://romo661.free.fr/

Fast Stereo Matching Demo
stereo matching, fast algorithm, cross correlation, fast correlation, dynamic programming, multiresolution, coarse-to-fine, pyramid, Box filtering, Similarity measure, image matching, stereo vision, computer vision, correspondence problem, area matching, epipolar image, stereo algorithm, rectangle, subregioning, fast mean and variance, disparity, demo, photogrammetry, fast stereo matching demo, $BN)BNI$G[(B $B1FA|I$G[(B $BN)BN(B $BB.EY(B
http://extra.cmis.csiro.au/IA/changs/stereo/

When Perl is not Quite Fast Enough
Explains how to write fast and efficient code.
http://www.ccl4.org/~nick/P/Fast_Enough/

RFC 2001
TCP Slow Start, Congestion Avoidance, Fast Retransmit, and Fast Recovery Algorithms. W. Stevens. January 1997.
http://tools.ietf.org/html/rfc2001

Fast Arithmetic Tips
Fast Arithmetic Tips, index
http://www.cut-the-knot.com/arithmetic/rapid/index.shtml

Fast Search & Transfer
Press releases for FAST.
http://www.fastsearch.com/press.aspx?m=63

Fast Cats Ferry Service L.L.C.
Fast Cats Ferry Service is now offering long term charters, long term lease or a buyer to purchase the yacht.
http://www.fastcats.org

Fast Statistical Methods
Fortran 90 and 77 codes by W.H. Press and G.B. Rybicki, for fast inversion matrices of an exponential form arising from autocorrelation functions of Ornstein-Uhlenbeck processes.
http://www.lanl.gov/DLDSTP/fast/

RFC 2001 - TCP Slow Start, Congestion Avoidance, Fast Retransmit, and Fast Recovery Algorithms
TCP congestion control algoritms. Obsoleted by RFC2581.
http://tools.ietf.org/html/rfc2001

Fast Company
Magazine dedicated to reporting about how the "fast companies" (entrepreneurs, and cutting-edge) are doing what they do. Contains best practices, lessons learned, and cases.
http://www.fastcompany.com/