Although the application is currently in beta release it does work. You can download the application on this web page. Make sure to download the latest copy and give it a test drive and see if it works for you.
When things were still broken you may have tried to fix things by adding a soft link to find your Tivo on the network. Since you no longer need that link you can remove it using terminal. Open terminal and type:
ls -al mDNS
The computer should return something like this
lrwxr-xr-x 1 root wheel 15 Jul 26 11:54 mDNS -> /usr/bin/dns-sd
to remove your link type the following
sudo rm mDNS
That's it. You should be done. Happy downloading!
UPDATE - 2/20/2013
As of 2/20/2013 iTiVo is working again. The application does needs a manual fix however. Please download the latest iTiVo and apply the fix outlined in the this MacITHelp post.