"Solder" that allows removal of complex ICs without fancy hot air 
nozzles etc.
Alloys with existing solder rendering it frangible and easily 
removable mechanically.
This sort of product has been around for some while.

        http://www.howardelectronics.com/chipquik/products.html

1.    How well does it work?

2.    Seems remarkably expensive. Probably a relatively low cost 
material. Has anyone got any idea what it is?

Presumably (but maybe not) a low melting point and some other 
properties
Antimony  - too high
Pewter?    550F

Here's some at under 212F http://www.atlanticmetals.com/lowmelt.htm

Gallium sounds promising http://www.answers.com/topic/gallium

Indium. Interesting 
http://www.aimsolder.com/product_line.cfm?product=specialtymaterials


        RM 

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