Amaya is a WYSIWYG web development tool for Linux that allows for local and remote editing.
Bluefish is an excellent code editor for Linux that works well with standard hosting plans such as Thinkhost. It loads quickly, and is available in the official repositories.
Basket allows you to organize and take notes through a clean, accessible interface. This program is a must-have for any Ubuntu user in college, and definitely beats shoving all of your notes into a text editor or word processor.