Info on Recent Modern Errors/Rarities

Does anyone know of a decent source for info on modern errors and rarities (other than the Redbook)?
I guess I should clarify what I’m looking for. In terms of errors, something like the 2004 Wisconsin extra leaf quarters (Up and Down types) would suffice. Also, the 1972 double die cents.
In terms of “rarities”, something like many of the modern Kennedy halves or 2009 nickels and dimes would seem to fit the bill.
I guess I should clarify what I’m looking for. In terms of errors, something like the 2004 Wisconsin extra leaf quarters (Up and Down types) would suffice. Also, the 1972 double die cents.
In terms of “rarities”, something like many of the modern Kennedy halves or 2009 nickels and dimes would seem to fit the bill.