Completely and totally off-topic and without any merit

[Tony Duell]

> Actually, that reminds me - I saw a chap in the UK trying to get rid of
> several kilos of the stuff a short while ago. I can't help thinking that
> *something* interesting could be made using it, although I'm not sure
> what. 

My first 3 thoughts, in no particular order : 

Barometer (or other manometer-type pressure gauge)

Mercury delay line (hey, that's on-topic)

Developing Dageurrotypes (?spell) (No, I don't intend to try this, I may 
hack cameras as well as computers, but I don't intend to start boiling 
mercury...)

-tony