There was an OPSI conference this week. Michael Wills wasn't able to make it but it still looked a good day from some of the notes I've been passed. OPSI, Office of Public Sector Information, encourages the re-use of public sector information. I can imagine this is no mean feat at times!
Hadn't realised how much information it contains until I started hunting around. For example it contains UK Legislation, Official Publications (through link to TSO), old Gazettes - a plethora of things you never knew you'd missed until now. Happy reading.