I've been using Calibre for several years now. It's managing my ebook library on every machine and I have yet to encounter a bug in any of its features. I use it to sync to my Nook, handle book metadata, convert from format to format, all without a hitch. In any ebook community Calibre has long since become the standard application. Many of the question are simply answered "install Calibre, it has what you need".

Kovid Goyal, the creator of Calibre has been, for me, as much of a poster-child of FOSS as Firefox or Linux. He has a point release every week, and you could just update the software without worry - nothing would break. He's open and frank about the development process - nothing hidden, or "thrown over the wall" no open-core features to abuse the power user, no excuses for stuff that isn't ready to release.

I have no idea why only now he reached 1.0 - it's been feature complete for my needs for a couple of years now. But as it stands, I wish to congratulate him for reaching the milestone and to thank him and everyone who supports the project - by submitting code, patches, bug reports, helping in the forums, donating money, and using the software.