What's a hashtag?
Hashtags are a community-driven convention for adding additional context and metadata to your tweets. They're like tags on Flickr, only added inline to your posts. Hashtags can be created by anyone simply by prefixing a word with a hash symbol: #myhashtag.
Voxli
Instant Voice Chat for Gamers and Teams
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Apptism is the only iPhone app activity aggregator. We track the activity of every app in the App Store. With anywhere from 50 to 100 iPhone apps being added and updated on the App Store daily, it is nearly impossible to keep up. Using apptism, you'll be able to monitor all app activity and find the app you're looking for quickly. App content is also aggregated from many sources to keep you informed on the latest and greatest. Our searching, sorting, and filtering options are nearly endless.
via Teachakidd
This is still in Beta. It offers free web storage and sharing services - some ads unless you "upgrade." It is currently accessible from inside the firewall and has a Terms of Use policy consistent with APS' filter. I haven't played around with it a whole lot, a friend recommended it...
The Blio eReader software is the new touchstone for the presentation of electronic books, magazines, and digital content. Its feature-rich design is perfect for today's power readers, who increasingly rely on digital content for work, leisure, and learning.
The extensive Blio Bookstore was created in partnership with Baker & Taylor, the world's largest distributor of literary content and value-added services, and the world's largest publishers.
Enjoy a vast selection of titles, with a superior, color reading experience on desktop PCs, netbooks, tablet PCs and mobile devices.
Building a 21st century school now has an easy answer:
Google Apps Education Edition
Google Message Security, powered by Postini, is included free for K-12 schools who sign-up by July 2010.
No hardware to maintain, no software to install, no ads, and no cost for schools.