They work fine until someone drops them on the dock, drives over them in
the marina parking lot (seen that), drops them down the companionway
ladder (that really does 'em in), etc.

Ive had quite a good experience with toshiba notebooks (though admittedly
mainly the older satellite pro's) and again it needs to be taken with a
grain of salt that i am a sample of one. I've destroyed so far through
abnormal use on land 2 comapq's, one sony vaio, and one thinkpad. I had two
of the earlier toshiba satellite pros that i put through various forms of
suffering including dropping numerous times and once accidentally driving
off with it on the roof of my car (it fell off at about 25km/h, closed. a
lot of scratching where it slid across the road, but still functions to this
day).

is
anybody opening up their laptop and sparying the circuitboards with
anything?

Keep your fingers out of it. Static electricity does in computers, like
spraying air across things....not good.

this seems to be a very common misconception to me..... Ive been into
computers since the vic 20, owned a commodore 64, an amiga 500, the first
ibm xt, then an at, then a 186, a 286, 386, 486, and so on.... my machines
started with 360k floppy drive, then twin 360's, then my first 1.44 drive,
untill the day i bought my first wopping double height 10Mb drive (I had no
idea what i would do with all that space in the days of machine code). i
built most of my computers by hand as did a lot of my friends, and despite
never owning a wrist grounding strap, ive never destroyed a component to
date. I do suffer from the odd static shock on my car door as a result of
living in a very dry climate and not being very selective about what i wear,
but i generaly ground myself with my hand as a matter of practice.

There are plenty of aftermarket PCB sparays that promise the earth, i wonder
how many of them are useful