a great, customizable content dictionary - very worth checking out
"the most comprehensive scientific research tool on the web. With over 370 million scientific items indexed at last count, it allows researchers to search for not only journal content but also scientists' homepages, courseware, pre-print server material, patents and institutional repository and website information. "
the biggest, baddest wiki of them all. A free encyclopedia that has more pages than any other online encyclopedia and ranks well on content and depth of coverage.
BookSeer: type in the book you've finished reading (title) and get a recommendation
personalized learning tool allows you to match student needs to vetted digital resources
Free online reference management for researchers, clinicians, and scientists
Scientific Commons: 965 Repositories and over 24 million publications
PC World's discussion threads on troubleshooting and repair
tech support, manuals, and troubleshooting for consumers