The Padres are looking for catching help according to MLB.com's Corey Brock (Twitter links), specifically seeking a backup for Nick Hundley. The team will not hand the newly acquired Rob Johnson the job, according to Brock.
The free agent catching pool is rather light at the moment, especially now that former Padre Josh Bard is returning to the Mariners. This is just speculation on my part, but the Angels could be a potential trade match. They have Mike Napoli, Jeff Mathis, Bobby Wilson (who's out of options), and top prospect Hank Conger (debuted in 2010) on the 40-man roster, and could look to move one in exchange for help elsewhere. The recently designated for assignment Max Ramirez could also be an option. Again, that's just my speculation.
Hundley, 27, hit .249/.308/.418 in what was essentially a platoon with Yorvit Torrealba last summer. He's never played more than 85 games in any of three big league seasons, but he's also never played fewer than 60. It'll be tough for San Diego to replace Torrealba's .271/.343/.378 batting line, but upgrades at second base, shortstop, and in center field will help mitigate the loss.