Diigo
Social Annotation: Seamless Integration of Social Bookmarking, Web Highlighter, Sticky-Note & Clipping; Killer features for finding, managing and sharing online information. A powerful personal tool and a rich social platform.
Zamzar - convert document, eBook, image, audio and video - free online file conversion
Zoho - Online Office, Word Processor, Spreadsheet, Presentation, CRM and more