I ran across this link recently, and I always want to share great lists of applications. Building your toolbox is always fun. Or should we say loading the app under the Christmas tree!
Ubuntu Linux Help: More Useful Open Source Applications 2011
PDF Mod is the new app that I picked up right away off the list. I haven’t had a lot of chance to use it yet, but I think it will come in handy. Install it with this link: apt:pdfmod.