I'm really sorry if this has been diaried already, but trying to search on Washington Post brings back a LOT of entries.... Anyway, washingtonpost.com has created an interesting tool for checking on and keeping up with votes by U.S. Senators and House Reps, the Congress votes database
. It lets you "browse every vote in the U.S. Congress since 1991" by session, by member and more.
You can subscribe to an RSS feed of votes by your reps. You can compare your reps' votes to the official positions of Democrats and Republicans.