European Court of Justice on saving dynamic IP-addresses.
Tagesschau.de: EuGH zur Erfassung von IP-Adressen – Speichern nur mit berechtigtem Interesse »
What this boils down to is if the government is allowed to store information about people visiting its websites. The ECJ ruling seems to send mixed signals.
Update: Falkvinge – Supreme Court rules that IP address allocation is personal data, but to what use? »