The Sunlight Foundation recently released a new study, "The Life and Death of Congressional Bills in the 110th Congress," which analyzes all bills that were introduced during the 110th Congress. They found that over the two years that Congress was in session, 11,059 bills were introduced, and only 4% of those became law. Most bills died in the committee of the chamber where it was introduced. 3724 were introduced in the Senate, and 7335 were introduced in the House.
The data is presented in several interesting charts, and this thing, which I admit I don't really understand. Maybe you are made of better stuff.
[Seen @ Legal Research Plus]