Macs are getting ever more popular. This year Apple have taken a big chunk of the PC market but given the rise of multiple devices in homes catering for either multiple users or to provide media centres with content, people are hanging on to their PCs to act as file servers or repositories. The newer OS X releases are thankfully able to read and write to Windows Operating Systems via the SMB protocol but it can often be a painful experience getting things to work reliably.
Apple has released iTunes 10.6. Suitable for both Mac and Windows, safe for jailbreakers, you should download and update.