Keyboard and Trackpad Not Working; Mac OSX Unexpectedly Quit?

Hey everyone... I think I may need to stop by the Apple store to figure this one out, but I just wanted to make sure if there was anything I could do on my own first.
So basically, on my MacBook Pro that I got nearly two years ago (late September of 2006) for the past month and a half has had problems. In the beginning, the mouse and keyboard would freeze up and just not work. Restarting the comp did nothing. Some times were worse than others (once it was frozen for 1.5 hours). Then it stopped, every now and then having a few freezes (sometimes when the keyboard froze but the trackpad was still good), but two days ago I had my comp not hooked up to an adapter. When the battery got low, the comp froze. I went to bed and closed the laptop, and the next day it was still frozen. I unfroze it, but then it happened again (I'm pretty sure the same situation... almost no battery)... and it is still frozen, even after multiple restarts.
Also, during the time when freezes weren't as bad, sometimes the keyboard would get stuck on one key, usually the volume up button (very annoying)... then I was told to restart the comp. When I came back, I was told that Mac OS X had unexpectedly quit.
Sorry that was a lot to read, but any help is really appreciated! Thanks!
Not sure if this is also important, but I did spill some water on the keyboard a very long time ago (late December '06)... it wouldn't take this long for that to cause the problem, would it?

Does booting up in [Safe Mode|http://support.apple.com/kb/HT1455?viewlocale=en_US] help at all? This boot mode checks the disk on startup and disables non-apple start up items and certain kernel extensions.
Steve

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