If you just want to read, Amazon's free Kindle.app is by far the best Mac reader. Use KindleGen[1] to convert .epub to .mobi (or scroll up, someone's already done this here).
However, be warned that it won't allow you to copy text even from an non-DRMed ebook, which is quite silly and makes it useless for anything that has code samples in it. For reading a book on screen it's pretty good though.
Comments
If you just want to read, Amazon's free Kindle.app is by far the best Mac reader. Use KindleGen[1] to convert .epub to .mobi (or scroll up, someone's already done this here).
However, be warned that it won't allow you to copy text even from an non-DRMed ebook, which is quite silly and makes it useless for anything that has code samples in it. For reading a book on screen it's pretty good though.
[1] http://www.amazon.com/gp/feature.html?ie=UTF8&docId=1000...