Between 1892 and 1954, the U.S. Mint produced 50 silver commemoratives--144 if you count mintmarks and dates--to mark important events around the country. After 1954, it wasn't until 1982 that the Mint produced another commemorative, the George Washington Half Dollar. Since then, the U.S. Mint has produced coins commememorating numerous events and people yearly.
Modern commemoratives are made in the following denominations:
Clad Half Dollar
Silver Dollar
Gold $5
Gold $10
Each commemorative design is struck two ways, as a satin finish uncirculated coin and a proof coin.