WebElements very thorough, one of the best on the web

Visual Elements from the RCS, a beautiful table

Periodic Table of the Elements from the American Chemical Society, requires Flash, has orbital diagrams

Dave's Wizzy Periodic Table

1001 Periodic Table of Elements Quiz Questions

A Periodic Table of the Elements From Mineral Information Institute

CHE1.4-The Periodic Table of Elements

Chem4Kids.comElementsPeriodic Table

CHEMTUTOR PERIODIC CHART

CHEMystery The Periodic Table of the Elements

eFunda Element Listing

Element Explanations Pt 1

EnvironmentalChemistry.com Periodic Table of Elements

Idaho Mining Association Minerals

Periodic Table of Elements

Periodic Table of the Elements - ChemGlobe

Periodic Table of the Elements

Spiral

The Periodic Table