I ran into an odd problem with an old 3G (glowy red buttons) iPod with the new iTunes release, and figured it was a good idea to pass along what happened in case anyone else gets conzuzzlificated. On syncing, iTunes told me that some huge number of tracks that always worked on there weren't compatible, and it helpfully deleted them from the iPod. On review, these were all locally ripped AAC tracks at fairly high bitrates. Looking at the summary screen, it turned out that iTunes 7.2 thought this was an even more ancient iPod (1st/second gen), complete with the wrong icon, although it didn't see any problem with the software version. On choosing restore, iTunes went ahead and downloaded the 2G firmware and installed it on the 3G. Fortunately, the iPod was willing to boot with this stuff loaded, but it came up in disk mode. At this point, iTunes did notice that it was really a 3G, and that newer software (that is, the stuff that was on there before all this happened) was available, so I went ahead and updated yet again. This succeeded. Finally, the iPod was still stuck in disk mode, but a reset (hold down menu and pause for a few seconds) brought it back to normalcy. At that point both iPod and iTunes were back to their old relationship with regard to compatible tracks.