This is in my sources.list:
# DEBIAN Repositories deb http://ftp.at.debian.org/debian/ wheezy main contrib non-free deb-src http://ftp.at.debian.org/debian/ wheezy main contrib non-free deb http://security.debian.org/ wheezy/updates main contrib non-free deb-src http://security.debian.org/ wheezy/updates main contrib non-free
deb http://ftp.at.debian.org/debian/ squeeze main contrib non-free deb http://ftp.at.debian.org/debian/ sid main contrib non-free
# Multimedia Zeugs deb http://www.deb-multimedia.org wheezy main non-free
# Trinity 3.5.13 deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian squeeze main #deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-v3.5.13/debian squeeze main deb http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.13... squeeze main #deb-src http://ppa.quickbuild.pearsoncomputing.net/trinity/trinity-builddeps-v3.5.13... squeeze main deb http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu squeeze main deb-src http://ppa.quickbuild.pearsoncomputing.net/slavek-banko/axis/ubuntu squeeze main deb http://depot-trinity.dotriver.eu/trinity-builddeps-v3.5.13/debian squeeze main
Sid sources are in your list! Unless you did some manual apt-preferences or apt-pinning configs, you get sid, not wheezy! if you already had some wheezy you get a mix, harder to maintain than straight sid.
@ Russell, apt-get -f install might help, try that first. Now you are probably running amixed testing/unstable system, you will learn much more about fixing apt conflicts!
And watch out with deb-multimedia, there has always been stuff (e.g. ffmpeg) in there that can cause dependency conflicts with official Debian packages. It's better to install only needed selected packages then disable it. Dist-upgrading on testing/sid with that repo enabled is asking for trouble.
I have not tried TDE 3.5.13.1 on Wheezy, That said I would use a official Debian mirror for Wheezy only
Do you know exactly what has changed in TDE 3.5.13 that no longer requires some squeeze packages? Last time I installed wheezy+ 3.5.13 they definitely were needed (I don't have the list to hand right now of exactly what packages)
David