Go figure, someone did port FBReader to OS X:
http://www.fbreader.org/macos/
http://gobunov.ru/projects.html
Apparently, you also need TrollTech's QT library and the enca and expat libraries (the last 2 are included).
I haven't tried this port yet, but will give it a try when I get my new MacBook Air as it looks to be an ideal eBook reading platform (albeit bulkier than my Sony Reader) especially since I've accumulated a bunch of .pdf and .html eBooks.
I've also found a few eBook reading programs on
www.MacUpdate.com in addition to the usual .pdf readers available free from Adobe, actually .pdf display is built into OS X (Safari and Preview) if you don't need any fancy features.
Chmox and Chimp - displays .chm files:
http://www.macupdate.com/info.php/id/15121/chmox
http://www.macupdate.com/info.php/id/18339/chimp
Maclit - displays .lit files:
http://www.macupdate.com/info.php/id/25659/maclit
Text Reader for Project Gutenberg files:
http://www.macupdate.com/info.php/id/18593/sophie
Multi Column Text Reader:
http://www.macupdate.com/info.php/id/12575/tofu
I've also used TextEdit to save .rtf files as .html and view the .html files in Safari (easier navigation, can change text sizes easier, no accidental re-editing of the eBook while reading it in TextEdit).
Dave
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http://groups.google.com/group/mac-book-air