Web 2.0 applications - Google Docs

http://voicethread.com/share/1370398/

Our presentation consists of 5 parts:
1.  What are the functions in Google docs
     1.1 doc , 1.2 presentation 1.3 spreadsheet 1.4 form 1.5 drawing
2.  What are the features make it different ?
     2.1 How to add people ?
     2.2 How to collaborate ?
3.  What are the advantages with collaboration function / any drawback ?