Last added:
last+7+days  last+14+days  last+30+days  added+any+time 
Web Widgets: Small objects that you embed on a personal webpage to display content, information or services
communication  publishing  learning_activities  poll_survey  interactive_maps  tracking 
Web Services: Websites you go to in order to benefit from a service.
create  create_documents  create_artythings  create_graphics  create_presentations  create_mindmaps  create_games  manage  catalog  manage_groups  run_meetings  share  learn_together  share_media  share_content  find  find_content  find_websites  find_software 

By default, only items added within the last 7 days are shown. Click on any tag below to see all items in a given category. Click on "added any time" to see the full listing of items (be warned that the page may take a bit of time to load).

web_services

create

create_presentations

MyPlick
(from website). Free service that lets you share, embed and discover presentations and slide shows online. You can upload your presentation documents in a variety of formats such as powerpoint, pdf, openoffice odp, etc. If you need to add narration or sound effect to your presentation, you can upload an audio file and have the option to synchronize the audio with your slides using our online easy-to-use sync tool. Once a presentation is made, you will have the choice to either publicly share with everyone or only share it within a small private group. You will also be able to find out how users are viewing your plick, for example, how much time people stayed on each slide. User feedbacks and statistics like this will help you to improve your presentation making skills.
 
Screencast
Web-service for sharing documents, images, presentations and more.

Not Free. On the one hand, various plans are available (see pricing page (www.screencast.com)). On the other hand, this is tightly tied up to a commercial product for creating presentations.
 
ScribLink
Create and collaborate using instant online whiteboards with web application Scriblink. To get started, head to their homepage for an instant whiteboard space. From there you can invite friends by grabbing your whiteboard's URL or sending an email. Once they join you, you can chat or phone conference (phone conferencing doesn't seem to be complete) with your fellow collaborators. Scriblink is a very simple implementation of the online whiteboard, but its screen sharing seems fairly real-time, which is always a plus.
 
Sketchcast
(from website). Let you record a sketch, optionally with your voice speaking. Any sketch can then be embedded on your blog/ homepage for people to play-back, and you can also point people to your sketchcast channel here (or let them subscribe to your sketchcast RSS feed).
 
SlideRocket
SlideRocket is a web application that provides everything you need to design professional quality presentations, manage and share libraries of slides and assets, and to deliver presentations in person or remotely over the web.
 
Slideroll, online slideshows
Sliderollâ„¢ is a photo slideshow maker that you can use to create slide shows with your photos. Publish your slideshows on the internet, put them on MySpace or YouTube, and e-mail them to friends.