National
WhatDoTheyKnow is the best place to view Freedom of Information requests that have been made, and to make your own.
TheyWorkForYou is the best palce to find out what your MP has been up to in Parliament.
WriteToThem is the best way to get in touch with your representatives as it keeps a log of how good they are at replying.
The Public Whip allows you to see and analyse how MPs vote.
Local
Write-Place blog. Lexia has been doing this longer than I, and has some fascinating posts about the dissaray Maltby Town Council fell into.
