Via Climate Crocks and The Air Vent:
The Metropolitan Police (that's metropolitan London, aka Scotland Yard) raided the home of blogger tallbloke and removed "many computers" for forensic analysis. Tallbloke was one of the first (possibly THE first) to break the climategate story, both parts I and II.
In a possibly related development, the Air Vent has been served with a DOJ notification to preserve all electronic communications around the time of Climategate II.
From Tallbloke's account, a few details emerge:
1. The cops had a warrant.
2. The cops were incredibly sloppy, only taking a few of the twenty or so computers tallbloke had in the house. Apparently no search was made for separate hard drives or thumb drives.