The following are some tools that may be useful.

Pattern Blocks

Geodot Paper for Geoboards

Geodot Paper 2

Polyomino Grid Paper

Alpha Shapes

Great Shapes Contest

Regular Polygons

Base Ten Blocks

Free Online Graph Paper

Base Five Manipulatives

Tangrams

Tutorials for the TI-83/TI-84 graphing calculator:

http://mathbits.com/mathbits/TISection/Openpage.htm

http://hotmath.com/graphing_calculators/ti84_movie_index.html

http://www.watchmeware.com/ti83ptutor.html

http://www.prenhall.com/divisions/esm/app/graphing/ti83/index.html (targets college students)

Tutorials for the TI-73 graphing calculator:

http://hotmath.com/graphing_calculators/ti73_movie_index.html

http://education.ti.com/downloads/multimedia/73explorer/TI-73%20Explorer%20Demo/TI-73%20Explorer%20Demo/TI-73_Explorer_content.html