This website contains a comprehensive list of open source windows applications. I hope it saves some license fee for some of us.
If you ever felt the need of having a centralized management of documents. A database with CVS repository like versioning system so that each individual can track down the changes/flow of thoughts by looking at the line additions/deltions only then pbwiki.com is your way.
PS: Although it gives only 10mb of space which looks small, in reality 1a4 page of text document costs just 2kb of space. So you can practically write a book of 5000 pages in this much space.
For image/movies/clip hosting photobucket is the way.