That looks like a problem. You have unstable version of gcc-4.4-base (4.4.3-9) installed, but now your unstable/sid is commented out. So when you try to install g++ which has dependency on gcc-4.4-base, it is trying to revert the gcc-4.4-base to that of squeeze (4.4.2-9). Install the package "apt-show-versions", that could show your what is installed and from which version. So either revert gcc-4.4-base to that of squeeze or uncomment the sid line, do an update and install "aptitude -t unstable install g++" to get sid version.
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