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Google sneaked in a useful API to its developer tools over the last few days, this time for Google Documents. The “Google Documents List Data API” is used to upload new docs or to grab a list of current documents from the "list" view in Google Docs (the screen you see when you first hit the site, showing all the documents you're working on).
There's also support for full text search. Coding samples are provided for coding for Java and Python (why no PHP?). A separate API for Google Spreadsheets provides more options for that service.