Natty removed Dexter! (?) Now ppa fails.

About a day after upgrading to Ubuntu 11.04, I realized Dexter was gone!!! I just yesterday found the hidden local share directory with the file "dexterdb" (and also my own little picture of me in the "images" folder). I'm hoping this means that all the contacts I had entered will return when I finally re-install it. However, since it was removed, the repo consistently fails to fetch. It was "removed during the upgrade", but I re-checked it (or both of them, I should say) in Synaptic, and I even removed it and re-added it manually, but still no love. The specific message is:

"Failed to fetch http://ppa.launchpad.net/lallenlowe/dexter-ppa/ubuntu/dists/natty/main/source/Sources 404 Not Found
Failed to fetch http://ppa.launchpad.net/lallenlowe/dexter-ppa/ubuntu/dists/natty/main/binary-i386/Packages 404 Not Found"

So 1. What do I do?! I was really loving this app! 2. When it finally is reinstalled, will that "dexterdb" file persist/merge and return my saved contacts? Should I back it up first while there's still time?? 3. Was this a Natty bug, or just a coincidence?

Thanks, and keep up the work on this great app.