Vo.O.OO 9/3/07
Production version

Added Features:
Derivatives - First principles, rules (product, quotient, chain), slopes, equation of a line using derivatives
Matrices - Determinant, inverse
Probability - Confidence interval (confidence levels)
Trig Identity - Trig identities from the unit circle, secant, cosecant, cotangent

12/3/07
Added features 
Complex numbers - Converting polar to cartesian and vice versa

13/3/07
Added features
Complex Numbers - De Moivre's Thereom, roots of untity, multiplying and dividing in polar form.

V1.0.00 14/3/07
Added Features
Probability - Confidence interval, confidnce interval (proportions), interval width
Matrices - Echolon form