Have you tried popping off the keys to see what the problem might be? In the past I've found that keyboard malfunctions have been physical problems and not computer/circuit board problems. Notice the pattern? Did you spill something on your computer?
Both the white and the black Apple keyboards were easy to clean, even in the dishwasher. You could open them. They're plastic mostly. A new white keyboard cost me around $28 last year at the Apple store in Delaware
My new iMac came with the wired aluminum keyboard. I suppose you could open it for cleaning [with a sharp knife, voiding the warranty?], but I haven't tried. Instead I bought a keyboard skin [ice] to protect it. Good thing, too. My cats like to walk on the keyboard. I'm not nervous about putting drinks near my keyboard now.
A keyboard skin won't help you now, but once you get your keyboard clean, it will make a difference. Mine is thin and doesn't affect the feel of the keyboard much. Found it on eBay.
The dishwasher cleaning appears to work with the aluminum keyboard too, http://discussions.apple.com/thread.jspa?threadID=1930818, http://www.youtube.com/watch?v=5XbPpdxnm6s&NR=1&feature=fvwp. Yes you can open an aluminum keyboard, http://mustardhamsters.com/?p=86, but will it work when you close it!!
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