The Mission and Public Affairs Division of the Church of England has updated its guidance note on “Countering far right political parties, extremist groups and racist politics”. You can read the January 2010 version here: Countering Racist Politics. (PDF also available)
Churches Together in Britain and Ireland has very comprehensive information at general election churches getting ready including two resource documents:
These can both be downloaded from here.
And there is a Find a Hustings page.
CCFON has announced that the former Bishop of Rochester, Bishop Michael Nazir-Ali is to host a series of General Election Hustings across England in order to help local Christians question candidates for Westminster seats.