One extra thing when upgrading to Woody is that the kernel is not upgraded by apt-get upgrade or apt-get dist-upgrade (which is sensible if you think about).  Instead you have to specifically apt-get install the relevant package.  For example my weekend kernel upgrade will be:

apt-get install kernel-image-2.4.16-k6

As listed at http://packages.debian.org/testing/base/

Cheers, Paul