This is a slide show about useful 50 web 2.0 that has collected by Fred Delventhal and Heather Hurley.

In this slide has lists of web 2.0 in 10 categories

• Networking and Professional Development Peyton Merlin and Riptide Furse
• Collaboration The Flat Classroom
• Presentations
• Flickr
• Images
• Music and Audio
• Video
• Storytelling
• Office Productivity
• Other

You can get link and description of these web 2.0 from go2web20.net