Zoho has finally added a central document management page called Zoho Docs to tie together its many useful online apps. The clean-looking, functional page looks much like the Google Docs start page, with a folder view on the left and all files - spreadsheets, documents, presentations, etc. - listed on the right.
You can create folders and drag and drop files among them, and also right-click files or folders to quickly share, tag, rename, etc. You can also sort the file list by created time, modified time or document type (such as documents or presentations).
I used to use Zoho for online word processing and spreadsheets, but switched to Google Docs specifically for the better document management (I still use it for invoicing).
Uploaded files show up in the same file list as Zoho-created files, and can be shared or moved among folders. You can download them again later, or view them if it's a file type Zoho knows how to convert (such as .pdf or Word docs). Zoho says you can also upload a zip file and unzip it after the upload, and Zoho will retain any folder structure within the zip file. Any uploaded files are scanned for viruses.
Another nice move: If you click a filename in the file list, it first comes up in a read-only preview in a tab on the Zoho Docs page, which is nice if you only want to read and not edit the file.
I'm a fan of Zoho Docs so far, though I did have to reload the page once when it wouldn't drag and drop files.