I had a similar experience with my last Mac (ibook). I spilled melted sorbet in it. Apple sent me a new keyboard for free, and it was perfectly fine.
.....
One thing I will say, and this probably applies to any brand of laptop, is get the AppleCare extended warranty! My current PowerBook and my last iBook both had hard drive failures that required replacing the entire HD. It's a pain, but if you have the AppleCare, it's free. I have found their tech support to generally be pretty good. I wouldn't switch to a PC.
i didn't even need a new keyboard but i imagine melted sorbet would be a bit stickier than diet coke.. but yes, DEFINITELY get apple care. i didn't have it on my powerbook which was STUPID but i was lucky enough not to need anything other than a couple of new hard drives (which i learned to replace myself as a result of not having apple care i have the WORST luck with hard drives. they kept telling me that those particular ones almost never fail, i was or a rather different opinion. i think there might have been some tiny wiring fault in the machine or something that nobody ever noticed that caused them to break down like that) and optical drives (one died in the diet coke incident, which luckily was still covered by my warranty. another one i ended up replacing myself.). if i'd needed a new screen i would've died those cost a fortune... i have apple care on my macbook pro so probably nothing will happen to it