Hi,
Just to give you a little confidence, I went on holiday last year with my PowerBook. We went sailing and after taking a lot of photos and filing my cards, I went below deck to empty them onto my PowerBook. The photos were in the process of downloading when a huge gush of sea water came flooding through the vent (Which was directly above the PB) and all over my camera, PowerBook and me 🙂 The gush had come from the local coast guard's practical joke. (They knew the people we were sailing with)
I was very quick and instantly killed the power to the PB and camera and got a towel to soak up everything. I then left it upside down and open to dry. However, I only left it to dry for a couple of hours before switching back on. (I would
not recommend this but the coast guards already accepted the concequences and wanted to know if it still worked) Luckily it did.
PB's are tough computers and the keyboard itself is a relatively sealed unit. I think there is a high posibility that your data will be able to be retrieved, even if there is a problem with the computer and it can't boot. Someone at the apple store should be able to get your data off the drive for you.
Good luck,
Sam