Eep, sorry about that. I've dumped everything from beer to coffee on various computer components, most of which have recovered since. OK, so I'm a bit of a klutz...
Anyhow, in addition to all the good advice posted above (especially about taking out the battery), I've also had success with a couple other things in these situations:
* If you need your system back sooner, after opening it and exposing its "guts" to the open air, a hair-dryer on *low* power can help to dry things a little.
* Also, a little light rubbing alcohol on a soft cotton pad or t-shirt scrap used to wipe off the exposed parts can keep them from getting sticky. It's labor-intensive to do it right, but it also keeps goo or residue from heating up on the mobo or other system parts and becoming a problem down the line. A funny story I experienced related to this: A couple years ago I dumped a half bottle of beer on my Extended Keyboard. I unplugged it, set it upside down, and patiently waited for it to dry. After a few days, the keys were a bit sticky, but it worked again. In the Bay Area, we have a huge problem with ants (think like roaches and NYC) and a couple weeks later I noticed a *lot* of them on my desk. After cleaning the desk and thinking it solved the problem, I was surprised to find them still hanging around. One evening, I finally noticed an ant trail that led *directly into my keyboard* - apparently they were feeding on the beer residue. So, I took the whole thing apart and rubbed it down with alcohol and voila, no ants!
All that being said, I always assumed (not being a PB or iB owner) that Apple's laptops had a rubber liner underneath the keyboard and mousepad for exactly these reasons. Is this not the case?
Good luck!