Hi, Our home network consists of: 1. Gateway Laptop running WindowsXP SP3 2. iBook G4 running OS 10.4.11 (PPC Chip) 3. AMD Desktop running WindowsXP SP3. 4. 500GB Western Digital external USB HDD. By the end of the year, we want to transition our #3 (the desktop) to a new iMac, and the existing desktop will be retired. I'm a little concerned about the compatibility between Windows on the laptop, the hard drives and backups from the desktop, and the iBook. I've read the guide at the top of the main forum here, and I am thinking that since we're going to be using 2 Macs, we should probably use NTFS and just get a third-party program so they can read/write to them. There's around 75GB of information on the external HDD right now. What's the best way to configure my external HDD so I can have a backup copy of files that can be read/written to on both my Mac and Windows machines? We were thinking of doing around a 200GB section for Time Machine as HFS+, and using the rest for actual data (pictures, music, etc.) Lastly, we have two copies of WindowsXP Pro SP3 (both 32 bit and 64 bit). Has anyone had any driver or application problems with the 27" iMac i7's running them in 32-bit or 64-bit modes? Is it just more "worth it" to go get Win7 x64 Home Premium? And one last thing that the guide was a little vague on, when exactly do you install Windows? I imagine you have to install the MacOS first, which will come preinstalled, but then what? Is BootCamp just an app you can launch within OSX, or is it more complicated? Thanks in advance!