nihil may have been joking, but a lot of this type of legislation is coming into force.

Look at this fairly old report for instance, which at the moment just covers Europe: http://news.bbc.co.uk/1/hi/uk_politics/2558129.stm

Quote "The European arrest warrant will allow British citizens to be extradited for crimes - some of them vague and undefined - that are not crimes in the UK. ....
There would be only limited extradition hearings in UK courts ......
The plans would mean that for 32 'serious offences', including terrorism, suspects could be handed to other countries even if their crime was not an offence in the UK."

So given Blunkett's desire to implement a police state, don't assume this won't happen.

Edit: To get back to the point, this warrant includes "Computer-related crime", whatever that may mean.