> the bottom?

Most likely just because heat rises :-)  Don't know where the LEDs are on 
your LCD, or it may even be a CCFL in there...

> But it doesn't ripple all that much... hmm.

That's because it has a touch screen on the front of it - not as easy to 
distort the actual LCD.

> I wonder... If you wanted to go all mad-scientist, how hard would it be to 
> concoct a chemical which forms a vaguely-functional LCD?

Read the first few parts of:

http://en.wikipedia.org/wiki/Liquid_crystal

It's relatively easy to get a "functional" liquid crystal nowadays, the 
extremely hard bit is creating one that works over a wide temperature range, 
gives a high contrast ratio, has a fast switching time, etc.

> [NB. I once tried to make an oscilator at school. The damn thing never 
> actually produced any sound. It did, however, heat up the two power 
> transistors with remarkable efficiency - I would never have believed that 
> 9V was enough to burn your finger on...]

I tried to make a simple AM transmitter, my first design transmitted about 
5cm.  I then proceeded to make the supply voltage higher and higher (in the 
end I think I had 5 or 6 30V supplies in series) and eventually I made it 
transmit about 3 metres while probably using half of the school's power :-)

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