Some of youtube's major contributors of math videos have web sites which you might find useful.
PatrickJMT.com
KhanAcademy.org
MathTV.com
BrightStorm.com
YourMathGal
DrPhilsMathVideos.com
MathIsPower4U.yolasite.com
For help with the TI-83 or TI-84 calculator, HCC's Calculator Connections might be useful.