'Nukular' is now in the dictionary!
Check it out.
nucular also appears in the Wikipedia Free Encypedia.
I thought this was particularly interesting (cut from the Wikipedia).
S Presidents Dwight D. Eisenhower, John F. Kennedy, Gerald Ford, Jimmy Carter, Bill Clinton, and George W. Bush (but not his father, George H. W. Bush) have all used this pronunciation. Jimmy Carter in particular had served as an officer on the United States Navy's first experimental nuclear submarine, and would have been well exposed to both pronunciations.
It has also been used by British Prime Minister Tony Blair..
Here is a link that might be useful: The Urban Dictionary