The Google data APIs ("GData" for short) provide a simple standard protocol for reading and writing data on the web. GData combines common XML-based syndication formats (Atom and RSS) with a feed-publishing system based on the Atom publishing protocol, plus some extensions for handling queries.

PhpGmailDrive is a new type of file sharing utility. Unlike typical file servers (say xDrive) it uses Gmail as backend file server. You can enjoy it simply by hosting a small PHP script in your web site without any database. Gmail file space is more than 2GB, so you can imagine you already have such a big space on internet. However, you will require a Gmail account (If you don't have any Gmail address, go GmailSwap or ask your friends.). PGD automatically connects Gmail server and fetches list of all attached files and generate downloadable links in a tree like view