I use iherp right now to track feedings and refusals. I write them all on the dry-erase board in the snake room and input into iherp after I'm finished feeding everyone, or if I have my iPad with me in the snake room I'll just enter it on there as I go. I'm also trying to breed for the first time this year so I'm tracking my pairings and locks on iherp too.
I think it's about time to try something different though. I work for a computer software company and I started talking to one of my developers about putting something together that will incorporate the camera of my phone, barcode scanner software and either a spreadsheet app or another independent app to do the tracking all from the droid.