A piece of must have software...

[redeye be]

Chubypig: no problem

ERROR: synergys.cpp,883: cannot read configuration "synergy.conf": read error: unexpected data after section name
synergys: no configuration available

You could try to change the names of your display.
The network name of my mini is mini (you can look up yours in the network prefs somewhere (sry not @ my mac right now))
change all the powermac.local-s to networknameofthepowermac.local. Do the same with the ibook name (also add the .local)

Let us now how it worked, good luck.

On a sidenote.
There is a little bug controlling a windoze machine with a mac. The numeric keypad does not work. The bug has been sent to the dev's of this nice little app, so i guess it will be solved soon.