I do most of my e-reading on mobile devices, but today I read about a new ePub reader called Bookle (
http://tidbits.com/article/12774 - no affiliation). I'm content with Calibre for occasionally looking at an ebook on the Mac but admit I'm curious about the new program. I haven't tried it yet because it's commercial software and to be honest I don't see many advantages over Calibre's reader (besides the more conventional Mac interface). Anyone take the plunge? First impressions?