Software for maintaining arbitrary file collection across multiple volumes

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http://askubuntu.com – I would like to use a single piece of software to maintain a collection of files. These files include music, movies, ebooks, win32 installers, photos and artwork. They are stored on my local HDD, remote HDD, CDs and DVDs. By maintain, I mean I want to be able to browse the entire collection on my desktop without having a live remote connection or mounted volume. Thumbnails for each item would be ideal. I don't mind having to shoehorn another application to suit this purpose. For example, I could imagine maintaining a collection of images using Shotwell, where each image represents a particul (HowTos)