Alex, Unfortunately, you are using incompatible backports of XFree86 4.3 and KDE 3.2. The XFree86 backport was built against libfreetype6 2.1.7, whereas the KDE 3.2 backport is built against libfreetype6 2.0.9 (the version included in woody).
See http://lists.debian.org/debian-kde/2004/02/msg00089.html for more details. Apparently libfreetype6 renamed functions between the two versions. See http://lists.debian.org/debian-devel/2004/05/msg01664.html and the reply to that e-mail for more info. Josh