Swot up for 6 May, now that it's been announced.
King's Cross also takes in the parliamentary constituency of Holborn & St Pancras. It's famously (or infamously?) a Labour stronghold, but the stats show a reduction in Labour's lead over the past couple of elections. You can submit local issues for this constituency too at Democracy Club — but there's only a few days left to do this. All these wonderful web resources that probably weren't around last election, here too are citizen-submitted leaflets for Holborn & St Pancras from across the party spectrum at Straight Choice.
As for the local government elections, a large chunk of King's Cross is also in the London Borough of Camden, and the two relevant wards are King's Cross and St Pancras & Somers Town. All six incumbent councillors are Labour, but Camden is a Lib Dem/Conservative-controlled council. You can find current information and past election results on Camden's 2010 election pages.
Vote however you like, just make sure you vote!
Clare Hill