Google Docs & Spreadsheets Service
Now you can create / edit / and share spreadsheets and documents using google, I would say this is a great service. I’m struggling whether should I upload all my existing spreadsheets? May be I trust google more than my machine 
If someone send a spreadsheet to your gmail account, let say excel, you can actually open and save that directly into your google account :
1. Open and save to google service directly from GMail
You can share the spreadsheet with other users, all of you view and edit that spreadsheet at the same time, and guess what? Chat at the same screen also, that’s the discuss and collaborate function. There are more and more functions being added to this service, really excited to see what will happen next.
2. Collaborate and Discuss the spreadsheet online
No PDF writer? No Microsoft Office? How about save it to offline file in different format?
3. Save as PDF, OpenOffice, etc
