Drop it to me - http://www.dropitto.me/
Drop it to me allows you to securely receive files from anyone to your Dropbox account. When file sizes are too large to send via e-mail or students need to turn in a project that is too large to upload to Moodle, they can go to your DropitToMe site and submit their work.
Ge.tt - http://ge.tt/
Ge.tt allows you to share files instantly, without setting up an account or downloading anything. This is a great web app. Ge.tt will begin uploading your files and instantly generate a unique URL for you to share. With the free account you receive 2 GB of storage.
Scrible - http://www.scrible.com
With Scrible you can bookmark pages and highlight and tag specific information within a webpage for future viewing. YOu can tag your information for later viewing. You ca add notes to highlighted webpages so your thoughts and ideas will not be forgotten. It is very easy to drag and drop the toolbar into your web browser.