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RemovingUpdatedPackages

First, setup your sources.list to what you should have installed. That is just dapper without security, updates or backports. Then

 apt-get install apt-show-versions
 apt-show-versions -a | 
  fgrep -f <(apt-show-versions | fgrep 'newer than version in archive' | cut -d' ' -f 1) | 
  grep dapper$ | sed -e 's/\t/=/;s/\t.*$//' | 
  xargs apt-get install --yes --force-yes

This is obviously a potentially dangerous command.