Many of the technologies listed in the left hand navigation bar can be used to develop multi-modal compositions:

• Blog entries allow individuals to easily embed pictures and video and usually allow individuals to drop in other HTML or Java code if desired.
• Wikis are basic websites and allow you to embed just about anything (images, audio, video, etc.)
• Profile pages on Social Networks usually allow users to easily embed anything.
  
• Digital documents found within Document Sharing technologies generally allow users to embed materials.

However, there are specialized Web 2.0 tools that allow for mutli-modal compositions as well, such as:

• Collages
• Maps
• Timelines

And to support research processes, consider using Social Bookmarking.

And if you really want some ideas, check out these 50 plus ways to tell a Web 2.0 story!