F-Droid, the FOSS repository for Android that gained some popularity
recently, has a request for Jitsi to be included that has been pending
since August 2013 now.
While Jitsi's built-in update routine serves you well when it comes to
updating Jitsi, additional availability through a free Android repo
might possibly ease up the process of discovering and getting Jitsi in
the first place.
Since I lack the skills to do it myself, I have to close with the mere
note that F-Droid highly encourage people to include their apps
themselves and offer a nice and clear manual for setting up a F-Droid