The TI-89 tutorial exists online in english and french, the english version is the most recent of the two, the french version will not be updated anymore.
I have done a PDF version wich corrects some mistakes in the online version, is easier to see and print because I have rewritten the document in Latex.

TI-89 tutorial PDF

TI calculators are great calculators. I use a TI-89 which is one of the best graphing calculators right now. It's CAS (Computer Algebra System) is very good for a small device like that. Here are some small programs I've written. You can also find my programs at ticalc.org

Program	Description	Screenshot
Date and corresponding day	This program will give you the date that corresponds to the entered date,it has some interesting photos in it.
BMI (Body Mass Index) 1.0	This program will give you your BMI as well as useful informations
WIOT 1.0	This program will give you the wind influence for a specific temperature.
Fibonacci sequence 1.0 Fibonacci sequence 1.1	This program will generate the Fibonacci sequence. Version 1.0 uses recursion while version 1.1 uses dynamic programming. Version 1.1 is much faster than 1.0
Easter Date Calculator	This program will give you the Easter date given a specific year.
Extremum 2 variables 1.0	This program will try to find the extremum of a two variables function.
Basal Energy Expenditure	This program will calculate your Basal energy expenditure
Bisection Method	This program uses the Bisection method to find roots.