Both Diane Farrell and Scott MacLean have signed on to it, and Chris Murphy is reportedly on the fence.
This is the agreement candidates are being encouraged to sign:
The Punch Clock Agreement
I believe citizens have a right to know what their Member of Congress does every day.
Starting with the next Congress, I promise to publish my daily official work schedule on the Internet, within 24 hours of the end of every work day. I will include all matters relating to my role as a Member of Congress. I will include all meetings with constituents, other Members, and lobbyists, listed by name. (In rare cases I will withhold the names of constituents whose privacy must be protected.) I will also include all fundraising events. Events will be listed whether Congress is in session or not, and whether I am in Washington, traveling, or in my district.
It's an interesting idea. It would be nice to know how much of their time is taken up by lobbyists, for example.