Programmable Toolbar Buttons - create complex function scripts using natural mathematic expressions to call out all of f(x)'s built-in functions, reference items on the stack as well as the named constants
Floating Mini-calc - click the zoom button on the f(x) window to toggle between a smaller, simple floating-window calculator and the normal full featured calculator window
Cleaner Interface - no more randomly placed editing windows! application remembers user's preferred window placement automatically and use of sheets for alerts and dialogs keeps your screen uncluttered
Internal Enhancements - many objects completely rewritten to follow the cocoa object model more closely