This morning I coded a little daemon for Grive2 (the Google Drive sync tool) to enable real time synchronization with your Google Drive cloud folder in Zenwalk.
All you have to do is make sure that the service is enabled, and you will notice a new "Gdrive" subdirectory in $HOME at next login.
Note : at first run : you once have to execute "grive" inside the Gdrive directory, and follow terminal instructions to set up Google authorization key.
Then it's automagic !
Have fun ;)