social bookmarks manager; allows you to easily add sites you like to your personal collection of links, to categorize those sites with keywords, and to share your collection not only between your own browsers, but also with others.
provides direct links to over 7000 scholarly periodicals which allow some or all of their online content to be viewed by ANYONE with Internet access for free
a list of 50+ similar services that are absolutely free and require no e-mail registration to use. Included in the list are file size limits, download limits and the amount of time the file remains on the server for download.