Calibre does some pretty basic conversion, but I wouldn't use it for authoring that anyone else would see.

Calibre itself won't solve the DRM issue(but that's still simple if you know where to look *cough* http://i-u2665-cabbages.blogspot.com/2009/02/circumventing-adobe-adept-drm-for-epub.html this may require a slighter less than current version of Digital Editions to retrieve the key initially *cough*), but it is a great ebook manager once you get rid of the DRM.

I'm not fan of DRM myself, but there are some bright sides to the Adobe crap. For one, as terrible as it is, the Adobe digital editions software does work just fine with Wine and installs just as easily as it would in Windows. Secondly, and most importantly, the DRM itself is joke. It's completely broken and easily circumventable after 5 minutes on Google(though this does make if a bit more annoying to know that publishers keep using it). I actually get most of my ebooks from Google's ebook store which uses Adobe DRM for the downloaded versions and on Linux I can have them downloaded, stripped of DRM and added to Calibre in just a couple of minutes.

Awesome, I look forward to seeing it. Eureka is one of my favorite shows.