U.S.Congress Votes database

Created by the Washington Post, this site lets you "browse every vote in the U.S. Congress since the 102nd Congress (1991)." Browse by aggregate or for individual members of Congress.

"This site publishes an RSS feed of recent votes by each member of Congress, and a feed of the most recent votes in both chambers. See the RSS page for full details.

This site is generally updated every day, although there is a delay between a vote in Congress and its appearance on the official Congress Web sites."