Program: SyncDocs
License: Freeware (limited file sync quota)
Description: Syncs folders between PC and Google Docs.
Website: http://www.syncdocs.com/
Other: A "portable" version is available (http://www.syncdocs.com/2011/08/portable-google-docs-syncing/), unfortunately it permanently adds menu entries to the context menu of folders and files ("Create Google Playlist" etc.). A PA launcher should avoid this behavior.