error upgrading to latest cm debs

Help me please 

I've modified my sources.list with the new repository graciuosly provided by 
Christian Muehlhaeuser adding this line to the file:
deb http://rs.fuzz.nl/muesli/686/kde_head/ unstable/
Today I've started the usual upgrade but the system hang up every time 
extracting the same package:
ksplash_3.2.0-0+cvs20040120+cm_i386.deb
I don't know how can fix this now

Many Thank

Domenico