Let's rephrase the question: Is there any instance of someone having an irreversible card corruption (any card, SD or SDHC) who had not installed the Fanoush SDHC kernel, the new Nokia firmware, or possibly both (ISTR Fanoush made a speed patch for the new firmware).

Remember, we're talking dead cards here. As stated previously, an I/O error can corrupt a card's file system, but this should always be solveable by reformatting.