There’s not much to getting up and going with shared folders. Either right-click a folder and select Share or go to a folder and select the Share this folder drop-down to invite people. They’ve also improved their file upload tool to support uploading multiple documents in one go — provided you’re sharing documents within their supported types. Images, Word documents, PDFs, Excel spreadsheets and PowerPoint presentations work like a charm; I tried uploading a plain text Greasemonkey script, for example, and it was rejected, so while Docs has almost opened the door for regular old file hosting and sharing, it’s still got its limitations.
Shared folders and more in Google Docs [Official Google Docs Blog]