Jason Schnitzler is one productive guy. Only a couple of weeks ago he announced his intention to build a media manager to fit somewhere between Media Companion and Media Info Plus, and boom. He’s already done it.
Ember Media Manager is a free solution to organise your movie files, including IMBD scraping, posters, thumbnails, fanart, nfo’s, media flagging, and everything else you need to buff up your XBMC experience. Pair it all with kryp2nite and Imagino’s lovely media flagging mods, the latest Aeon Auriga skin, and you have yourself a media centre geek’s wet dream.

Ember Media Manager is still in alpha, but seems to work very well nevertheless. Unlike the established Media Info Plus, Ember’s interface is clean and uncluttered, and its performance on large movie collections is impressive.
Unfortunately, Ember is also Windows-only, and available in 32 or 64-bit versions. Until the developer impresses us all with a cross-platform compatible Mono release, I can attest to the fact that Ember can run without issues on OSX in a virtual machine environment like Sun’s excellent (and free) Virtual Box.
In any case, I highly recommend keeping an eye on Ember’s progress. It’s shaping up to be the end-all solution to all your movie management needs.