Better late than never. 
The signatures is more of a certification, coupled with links to the vote. This way both houses have access to the other houses' debate and vote and thus avoid confusion over whether or not a bill had passed the other chamber, which has been a pretty significant problem prior to this congress. In fact most of the confusion regarding bills this congress dealt with those bills that passed in one of the chambers in the 4th or even a prior Congress like the Freedom to Drink Act and thus before this system was introduced.
It also helps us see that all three Congressional leaders are performing their Constitutional duties, especially the Vice President, where in the absence of a signature, it would just get slotted to the President and there would be no way for people to see the activity occurring in his very important role in managing bills between houses and between the Congress and the President.
It is possible that this one just got overlooked, because I include Goldwater in most all of my PMs to House members and I know communications between PiT and myself are also sent to Goldwater, so it is likely that it is just buried in that. It is a new system just introduced in the 5th Congress and so a few glitches is to be expected.
However, when you consider the fact that the previous 4th Congress only put two bills on my desk as President and as President Dfw received about a dozen from the 5th Congress, I think both the competence of the leaders involved and the soundness of the system generally, has been proven. I think the 5th is the most efficient and effective of all the Congresses so far and that is largely do to improvements in the noticeboards, and the presence of these "links certified with signatures".
