While somehow off-topic, here's a thought to help the extras-testing procedure:

Whenever a new version of a package is uploaded, send an e-mail to users that voted a previous version and ask them to test and vote again:

Here is what I think:

• I vote for a program (yes or no)
• A new version comes out
• I receive an e-mail that notifies me of the new version and asks me to evaluate it and vote it.
• (perhaps) after a couple of days, I receive another mail asking me to vote for this package (in case I forgot - a couple of days should be enough for testing it)

The method could use two user options:

• An option per user, per package, where each user can ask not to be notified about new package versions.
• An option per user, indicating that he is willing to test new apps.

The first option can be a new per-package in extras-testing option "Notify me for new releases" which would be auto-enabled whenever I vote for it.

The second option can be omitted and be considered as implicit since (in theory) whoever votes for an application in extras-testing is testing it.

This will also help in cases where someone thumbs-down an application and removes it. Currently he will not find out of a newer release.

From the user's POV, this method would be like a list of all packages that she evaluated.
From the developer's POV, this will be like sending e-mail to all previous voters.