So, it seems almost every time I go to sync my iPad, when I first plug it in, it hangs for a while then iTunes comes up with a "Unknown Error (-27)" message.
If I clear that and manually click the Sync button, it then works.
I have a 3GS 32GB and this started for me the past Tuesday... (-27) It seems my photos no longer sync to the phone, however they can be transferred from the phone or removed from the phone via sync....