Rutherford's Model vs Thompson's vs Dalton's: Scarecrow Science
Youtube #1 (6&1/2min vid on Thompson vs Rutherford's atom) also includes Borh's atom
Youtube #3 (7min vid on Thompson vs Rutherford's atom) also includes info about alpha, beta and gamma radiation
Simplistic Thompson vs Rutherford animated models
Radioactive decay interactive simulation (various elements/isotopes): Scarecrow Science
Half-life animation showing radiation: Scarecrow Science
Geiger Counter Activity (sources, barriers, etc): Gigaphysics
Other Websites: