We also visited Knit 'n Knibble in Tampa. This was a great shop too. Caroline, the owner, was there to meet us and talk for a bit. She had several customers to attend to in the shop (always a good thing!) so we didn't stay long.
We tried a few times to visit Knit Wits in Key West but every time we managed to get by there it was closed though. They clearly had their days and hours on the door but we just couldn't manage to be in the right place at the right time. September is a slow time down there so a lot of the shops take vacations and cut their hours this time of the year. Unfortunately we weren't able to catch up with them though it looked like a lovely shop through the windows!