This is basic, but since Titanium backs up to the SD card, doesn't this get wiped out when you flash a new ROM? When I unlocked and rooted, my SD card was wiped (as far as I can see, all my photos, etc, were gone). How does this work?
No. Your SD card does not get wiped with a new ROM, so the TitBu folder stays. You do need to install TitBu again, but your backup files are waiting for a restore.
Unlocking/Locking DOES wipe the SD card. It is the only thing that does. Since you should only ever unlock once, it should not happen again.
Awesome, I figured it was something simple. That makes perfect sense, thanks! I first realized this when I went to restore my GoSMS backup and it couldn't find it, so I checked my pictures, GONE! Glad I had G+ auto-upload turned on since it came out!