To use and manipulate google docs, you can use Google Data API provided by the Google.Download the API and use it for your use.

For example.You can use "openURL" message in shared NSWorkspace provided by the API.

https://docs.google.com/present/view?pli=1&id=dftpzpbs_0g5w3q5cg

This is the official google documentation for the API.

http://code.google.com/p/gdata-objectivec-client/wiki/GDataObjCIntroduction


To use DropBox services also,you have no other choice but to use the SDK provided by the Dropbox itslef namin "Dropbox for Developers"...

https://www.dropbox.com/developers/reference

You can download the SDK and use the available REST API to access the Dropbox services.

And for the iCloud, lots of documentation is available from Apple itslef. Check it out

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Computer Tutorials,Dropbox,Google,Google Docs,iCloud,iOS,iPhone,iPhone Applications,iPad,iPad Applications