What do the enlightened use when the rest of us use Excel?
murrayb: I use and like Gnumeric- http://projects.gnome.org/gnumeric/
it tends to be lighter and faster than the Open Office equivalent and I haven't found any features which it lacks.  Excel has more prettiness options for display/print but from what I have read Gnumeric beats it's pants off in terms of math and statistics functions.