Passport to Web 2.0

http://www.slide.com
Upload images and create your animated slide show.

http://ccmixter.org/
ccMixter is a community music site featuring remixes licensed under Creative Commons where you can listen to, sample, mash-up, or interact with music in whatever way you want.
Remixers If you’re into sampling, remixing and mash-ups grab the sample packs and a cappellas for download and you can upload your version back [...]

http://scratch.mit.edu/
Scratch is a new programming language that makes it easy to create your own interactive stories, animations, games, music, and art — and share your creations on the web.
Scratch is designed to help young people (ages 8 and up) develop 21st century learning skills. As they create and share Scratch projects, young people learn important [...]

http://www.gapminder.org/

Gapminder is a non-profit venture promoting sustainable global development and achievement of the United Nations Millennium Development Goals by increased use and understanding of statistics and other information about social, economic and environmental development at local, national and global levels.  We are a modern “museum” that helps making the world understandable, using the Internet.

Web-based word processor and spreadsheet (i.e. Excel) application with a bundle of group-focused features: file sharing, document sharing and collaboration, contact management tool, edit/update RSS notifications and more.
Peepel Features:

Create, Edit, Share and Manage your documents online.
Import existing documents and spreadsheets into your Peepel account. Supports most of the popular formats (.doc, .odt, .xls, .ods).
Export documents [...]

http://www.co-ment.net/
Co-ment Features

Create, edit, share, collaborate and annotate text documents online.
Upload existing documents from local hard drive or create new ones.
Supported document formats: Open Office, Microsoft Word, Rich Text Format, Text docs (txt), etc.
Annotation: Highlight any text and comment on it.
Allow others to see and/or comment on the text.
Different sharing modes: Observer, Commentater, Moderator, Editor, Owner.
Document [...]