Mac:method has released f(x) 2.5, the latest version of its programmable scientific RPN calculator for Mac OS X. f(x) features 20 scientific functions, decimal, hexadecimal, and binary input modes. The new version adds copy/paste support, expanded numerics, and user interface improvements. f(x) 2.5 comes with a 60-day trial; the software costs US$15 to register.