I have a laptop and use an external hard drive for my iTunes library. This system works well for me, except sometimes I found myself frustrated that I couldn't update my contacts and calendars on my iPhone while I was on the go. When I'm away from the external hard drive, iTunes complains. I recently discovered that if my iPhone is charging over USB, using the Sync system menu (chasing arrows in the upper right corner of the screen) on 10.5 syncs my iPhone to iCal and Address Book. This is great! Now I don't have to launch iTunes unless I want to sync media. This hint might be generic for the iPod Touch or other iPods, but I haven't tested it. [robg adds: I'm not sure if this is 10.5 only or not; if someone can test on 10.4, please comment.]

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