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To the best of my knowledge, both pronunciations are in wide use. I associate the one with initial stress (like centimeter) with non-US speakers, while the one one with stress on the second syllable (like thermometer) with US speakers.

The American Heritage ® Dictionary of the English Language: Fourth Edition states:

USAGE NOTE: Although the pronunciation of kilometer with stress on the second syllable, ... is often censured because it does not conform to the stress pattern in millimeter and centimeter (it originally came about by false analogy with barometer and thermometer), it continues to thrive in American English. In a recent survey, 69 percent of the Usage Panel preferred this pronunciation, while 29 percent preferred the pronunciation ... /on the first syllable/ .

The special characters didn't transfer well, so I added the editorial note.

No, they think the way Hollywood pronounces it is the only way. I usually pronounce it like centimeter, but I'm weakening as I hear it on TV, radio, and on the street pronounced what I consider the wrong way. Thanks for you input.

Even with initial stress, I've heard it sometimes like “KEEL” and sometimes like “KILL”

I relied on what I learned in grade school 40 years ago and an old Websters dictionary, circa 1900. The rule stated in the dictionary is units of measure are pronounced the same way. Gauges (tools) are pronounced the other way. Easy to remember for me.

I know what your mean: idiot President Geo Bush said nuke-ya-lur or something damn close to it. It bugged me. Why didn't his staff educate him - too late I guess to learn new tricks.

All this confusion could easily be avoided if instead of pronouncing kilometer one way or another they would instead say 0.621371192 mile.