I don't get it!! If I want to sync even just a single extra photo to my iPhone 4, I get an out of memory error in iTunes, despite there being around 6gb free (and that's not including the 'other' category). But.... I can work around it. If I remove all my audio and photos from my iPhone 4, THEN sync all the photos, THEN sync the audio, it all fits happily. Any ideas? I know this is a common(ish) problem from reading around, and tried removing my cache. Working around it is fine, but it has turned adding just a couple of new photos into a process that takes north of 1.5 hours to complete!!