For occasional use, you could use the Equation Editor included in Microsoft Office (a free and basic version of MathType). Additionally, the editor in OpenOffice seems quite nice.
Math Program - by Lou on 06-18-2006 at 04:32 PM RE: Math Program - by J-Thread on 06-18-2006 at 05:14 PM RE: Math Program - by welshboy222 on 06-18-2006 at 05:20 PM RE: Math Program - by Thor on 06-18-2006 at 06:21 PM RE: Math Program - by Tochjo on 06-18-2006 at 06:24 PM RE: Math Program - by Rik on 06-18-2006 at 06:25 PM RE: Math Program - by Lou on 06-19-2006 at 03:15 AM