From Alex's Sony Q&A thread here:
https://www.mobileread.com/forums/showthread.php?t=7273
Quote:
Operating Systems and Browsers
Q) Will Sony provide software and support for customers using Macs or Linux?
A) Currently our application has been designed for Microsoft® Windows XP®. External media such as Memory Stick and SD cards provide content transfer functionality from non-Windows based PCs, but you will not have the ability to buy books or enjoy the benefits of managing your content and Reader through the application. We are aware of the desire of non XP customers to have support and are considering how and when we can support them.
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"Currently" being the ambigous-but-hopeful word of interest.
If you want native Mac access to the Connect Bookstore, that could be a while. If you want to read content from elsewhere, then all you need is a cheap card reader and you're all set. Classic literature is freely available from sites like Gutenberg and manybooks.net. Books for purchase in open formats that work with the Reader are available from a few forward-looking publishers (e.g. Baen for sci-fi).
That said, as MadB and Harry noted, plenty of folks are using the Reader with Macs, and a few are using the Connect Bookstore by running XP on an Intel Mac. If you do a search on the forum you'll find several threads about this, or post a question.
Cheers,
Bob