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I assume you are asking about 50 States Quarters, right?

2004 Wisconsin Leaf Errors: Coins exhibiting these errors came from the Denver Mint. These coins range in value, but currently can fetch $50-100.

My next favorite is the: Kansas "In God We Rust", or Humpback Buffalo Error.

Here are some more references:
2005 Minnesota Double Die & Extra Tree Errors: There are a lot of errors associated with the Minnesota reverse. Values range from $10-300+.
2005 Kansas "IN GOD WE RUST" and Humpback Bison errors: Values really vary with these errors, but sometimes can reach up to $100.
2006 Colorado Cud Errors: Cud errors (an unintentional bump caused by a dent in the die) on the reverse side of the quarter can be viewed at the three o'clock position along the inner side of the rim. These quarters were released by the Philadelphia mint. Depending on the size of the Cud, these quarters can fetch a value of $5-$35.
2007 Wyoming Double Die Reverse: This lesser-known error was minted in Philadelphia and sometimes can be hard to spot with the naked eye. With magnification, varied doubling around the saddle horn can be seen. Values for this error are unknown.
2008 Arizona Extra Cactus Leaves: Die breaks caused extra leaves on the Arizona Reverse. Values vary, but coins are generally sold around $10-20.
2009 District of Columbia Double Die Reverse: Some quarters minted in Denver exhibit doubling on the "ELL" in "ELLINGTON." With this variety, a greater degree of doubling translates into higher demand, but the market for this coin is still too young to solidify any general value.
State Quarters on Nickel Planchets: These odd coins can show up in any year, but seem to be more common in the first year Delaware, Connecticut, New Jersey, Pennsylvania, and Georgia coins. Accidentally struck on Nickel planchets, these coins are slightly smaller than a regular quarter. Error coin diameter size = 21.2mm. Regular quarter size = 24.3mm. Values for these coins depend on condition, but can reach well over a thousand dollars.
Fun Fact
New Hampshire prominently featured their famous Old Man of the Mountains for their design. This facial profile, created by nature, collapsed only two years after the quarter was released.

Chase007 THat's a great list!!

Thank you so much for the information you all gave I appreciate that alot.....i saw you gave advice about the clad coins I noted that thee Massachusetts coin does have a slight red tone to it

Philadelphia 'P' rotated reverse 180 degrees.

Same here.