GTK+ Recent Files Scrubber is a compact, lightweight Python script which uses GTK's RecentManager to watch for updates to all globally-available "Recently Used" lists (the ones which appear in Open dialogs and the like) and filter out anything in the folders you blacklist. Blacklist entries are hashed to make reading the blacklist not worth the effort.
PDFvcon is a GUI front-end for Ghostscript that converts the version of a PDF document. If you have software that can accept only up to version 1.4 of a PDF document and the file you have is 1.6, then this is your answer. It was created out of a need for the author to be able use some of his old Windows software.
claws-mail-indicator is a simple plug-in which adds support to Claws Mail for the Ubuntu indicators. Notifications are displayed in the Messaging menu, with the option to display a notification bubble each time new messages arrive. It was developed and tested on Ubuntu 11.04 (Natty) 64-bit.
gtk-screenshot is a program for taking screenshots. It captures the screen or a window and saves the image in the PNG format. It is similar to gnome-screenshot but it's not a GNOME application. All parameters may be specified on the command line, or the application can be graphicaly driven.