Common file hosting services include Amazon Cloud Drive, Box.net, Dropbox, FileServe, Gladwinput, Google Drive, Hotfile, Humyo, Jungle Disk, Apple's iCloud, iDisk, MediaFire, Mozy, RapidShare, Scalibux, Microsoft's SkyDrive, Softonic, SpiderOak, SugarSync, SwissDisk, Ubuntu One, Wuala, ZShare and many more. Wikipedia has a "Comparison of file hosting services" page. A list of over 1400 hosting services can be found at filehostwatch.com.[1]
Calameo, Docstoc, edocr, Google Docs, Issuu, wePapers and Yumpu are document-sharing services.