Quick Preview of Files under Ubuntu - Gloobus

Gloobus is an extension of Gnome designed to enable a full screen preview of any kind of file. Ever been annoyed by those tiny miniatures of your files that are helpless. Outraged by the fact that there's no miniature for half of the file formats you're using. Excruciated by the painful loading time to see if you're dealing with the right file? Hail to Gloobus, for tis' is the Holy Grail of preview! Designed as an expendable, standards-compliant previewer , so that it plays nice with Gnome and can be easily extended to support any kind of file, Gloobus enables instant previewing of your files, without even having to open them. Hit space, and BANG, here's the content of your file, displayed as it would if it was opened.

Currently, Gloobus supports:
Source: C++, JAVA, PHP, SH, PYTHON,
Images: JPG, PSD, XCF, PNG, GIF, SVG, ICNS
Documents: PDF, CBR, CBZ, DOC, ODF, XLS, ODS, PPT, ODP
Music: MP3, OGG, MP4, MIDI, WAV
Video: MPG, AVI, OGG, FLV, WVM, MKV
Other: Folders, Plain text files

Installation:
1) Add following lines to /etc/apt/sources.list
deb http://ppa.launchpad.net/tualatrix/gloobus/ubuntu jaunty main
deb-src http://ppa.launchpad.net/tualatrix/gloobus/ubuntu jaunty main

2) Add the key
sudo apt-key adv –keyserver keyserver.ubuntu.com –recv-keys 0624A220

3) Update the packages list
sudo apt-get update

4) Upgrade to the latest patched Nautilus
sudo apt-get upgrade

5) Install Gloobus-Preview
sudo apt-get install gloobus-preview

6) Finally, quit and restart nautilus
nautilus -q
nautilus &

Now, select a file or a folder on your desktop or your file manager, and press Space, a Gloobus-Preview windows will be launched with the quicklook of the folder or file content. Enjoy!