According to Michael L. VanLoon -- HeadCandy.com:
>
>
>I once completely ruined a 286 motherboard attempting this.  I hope
>you're not unsoldering parts. :-)
>

Ahhh there is a real art to desoldering, especially on multilayer
boards with vias.  If at all possible, what you do is cut the legs off
the thing you want to desolder and then just pull the legs out and
suck the holes dry.  This is good if the thing you want out is a)
cheap or b) dead and the legs are accesible.  If you have to get the
thing out in one piece then using a "proper" solder sucking machine on
one side of the board and a normal soldering iron on the other side
(both at the same time) can help to melt the joint right through
without "prickling" the board.  Also it is sometimes better to
resolder a half desoldered joint and try again than persist at getting
out a little bit....

Brett"Actually, yes, I had to desolder 4 of my simm sockets because
some ham-fisted bastard (not me) had broken the clips on them and the
board survived the ordeal"Lymn

This is way off topic for the list.... any follow ups via email :-)

-- 
Brett Lymn, Computer Systems Administrator, AWA Defence Industries
===============================================================================
  "Upgrading your memory gives you MORE RAM!" - ad in MacWAREHOUSE catalogue.