"The Public Whip is a project to watch Members of the United Kingdom Parliament, so that the public (people like us) can better influence their voting patterns."
A variety of "scrapers" collect data from the Parliamentary web site, including information about MPs, proceedings, and in particular divisions (votes), as well as interesting statistics such as attendance and "rebellions" (cases where an MP votes against their party). A Web front end allows one to search for MPs by name, region or discussion keyword.
The companion site, theyworkforyou, allows members of the public to search, comment and annotate parliamentary proceedings.