Inside Europe has info about the history, countries and institutions of the European Union.
Vote 2001 is the BBC General Election 'site. News and stats in abundance. See also: the awesome Guardian Politics database. Simply incredible amounts of crosslinked information.
But nothing beats Votémon [cheers Tom B], the Children's BBC introduction to the main players in the election. Terrifying: the half-man, half-logo William Hague turns into when you click 'tell me about the Conservative Party'.