I want to know if this is possible and, if so, how to do it. Currently, my iMac's HD is overloaded by my 220GB collection (mostly podcasts). My idea is to have the iTunes collection on an external hard disk (e.g. a Western Digital Passport 320GB). When connected to the iMac, iTunes on the iMac reads the MP3's from the external disk. Then, when I'm on the road with my MacBookPro, the MBP's iTunes would read from the same external hard disk. A problem could be how to make the second MBP recognize any updates to the iTunes list that has changed when used with the iMac since the last hookup. Any ideas? I have no idea how to start, so step-by-step guidance would be appreciated.