Adobe Acrobat is a commercial tool for manipulating PDF files. Earlier I was using CUPs - printing system, to export PDF files. I’ve also tried out gv for the same purpose. However, I needed complete editing of pdf documents. My search ended with PDFedit software, which is free and open source editor for manipulating PDF documents. The software available in both GUI and CLI (commandline) interface.

Linux PDF editor - PDFEdit Software

That seems to be on minds of many who want to use the swanky StumpWM Lisp-based Window Manager for X. Written entirely in Lisp StumpWM takes REPL programming paradigm to the next level, some people have compared this one to the original Symbolic Lisp machines feature wherein any running program's source can be displaced and modified on the fly.

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Always a lightweight desktop fan, my current window manager is Fluxbox. Here is a simple example that allows us to launch multiple programs like my pidgin (formerly gaim) Instant messenger client and Iceweasel (firefox) graphical web browser with a single click of fluxbox menu item.

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This guide describes how you can use the CD/DVD burning application K3b to convert songs from an audio CD into MP3 or Ogg files that you can use on your MP3 player, for example (if you choose the Ogg format, your MP3 player must support it).

http://www.howtoforge.com/convert_songs_to_mp3_ogg_with_k3b

This article shows how you can use an iPod on a Linux desktop with Amarok. It covers how you can upload MP3 files from your desktop to your iPod, download MP3 files from your iPod to your desktop, and how you can delete files on the iPod. Normally, Apple's iTunes software is needed to manage an iPod, but iTunes is not available for Linux. Fortunately, there are Linux alternatives such as Amarok that can handle the task.

http://www.howtoforge.com/linux_amarok_ipod