I was wondering if its possible through bootcamp (or any other way) to have a third partition on a given boot camped hard drive that I could store music and documents and the like so that both OSX and XP could both see? Thanks for any help.
although i fear this won't work for iTunes as it copies it's files to it's own folder
You can add a FAT32 partition. Both Windows and OS X can read and write to FAT32. There are some limitations to FAT32, such as a maximum file size of under 4GB.
Gengis Khan, you can tell iTunes where to store files. Just tell it to point to the FAT32 partition.
I do this all the time for not only Windows and Mac to share, but also for multiple installations of Mac OS X (Tiger, Leopard, Client and Server).
For Mac and Windows to play together, you will either need to make a FAT32 partition, as both can natively read and write to it. Note that the Mac (out of the box) can only read NTFS. Through programs like "NTFS-3G", the Mac can be enabled to also write to NTFS partitions. (As of today, I'd not waste the money for Paragon, as it does not seem to offer any real differentiation other than a fee.)
Note that applications such as NTFS-3G can introduce annoyances to the Mac that you'd otherwise not have, such as littering NTFS partitions with .DS_Store files (though this will also happen to any writable partition that you explore from the Mac, including FAT32)
As for iTunes sharing the same set of files, that's simple. Just set the library location settings in iTunes to the said common partition, preferably in a designated folder rather than strewn throughout a raw partition.
NOTE: The iTunes library setting is also how you can easily set multiple user accounts to utilize the same set of data, rather than having separate iTunes libraries - all assuming you want a single source of music, that is.
FAT32 offers a reasonable set of options for small sized files. If for example, you wanted to copy a 4gb ISO, FAT32 is NOT the way to go. Keep this in mind if you are doing any audio or video recording or if you are using uncompressed formats such as WAV or AIF.
NOTE: On the Mac side, this common partition is useful for allowing multiple OS installations to share common files, such as user data and applications (assuming they are both supported in the OS and can be installed or happily moved somewhere other than the Applications folder). I have had some instances where I had to install in 10.4, archive or remove the portion of the install that was installed to the common partition, and then go into 10.5 to perform an installation the same way. Some application must be installed, rather than copied and this was the most direct way to address it for me. Sometimes settings are shared in the application folder, so beware of your settings.