Mac TTS is easy to activate; follow instructions available via the "Help" menu in the Finder. I searched on "read text aloud" in Help to find how to do this.
None of the voices are "great", in my opinion, but most of them are "OK". I admit, grudgingly, that Windows seems to have better voices. :-)
Windows users may want to use the following:
Mozilla Firefox with Speak It is a stripped down, streamlined re-build of Mozilla offering tabbed browsing, pop-up blocking, and significantly increased security over and above Internet Explorer. Firefox is customizable and extensible, and, by adding themes and extensions, can be configured for each user. The Speak It extension provides text-to-speech support on all web pages.
www.mozilla.org/products/firefox; https://addons.mozilla.org/en-US/firefox/addon/3552 Both of these are free.
(A tip of the hat to Skip Stahl, of CAST, for this information.)
