google docs basics + spreadsheets + presentations

Here's what you can do with documents:
Upload and convert Word documents, OpenOffice, RTF, HTML, text (.txt), Open Office (.odt), and StarOffice Writer (.sxw) files (or create documents from scratch).
Easily format your documents.
Invite others by email to edit or view your documents.
Collaborate online in real time and chat with other collaborators.
View your documents' revision history and roll back to any version.
Publish documents online to the world, as webpages or post documents to your blog.
Download documents to your desktop as Word, OpenOffice, RTF, PDF, HTML or zip.
Email your documents out as attachments.

Here's what you can do with spreadsheets:
•Import and convert .xls, .csv, .txt and .ods formatted data.
•Export .xls, .csv, .txt and .ods formatted data and PDF and HTML files.
•Use formatting and formula editing so you can calculate results and make your data look the way you want it.
•Chat in real time with others who are editing your spreadsheet.
•Create charts and gadgets.
•Embed a spreadsheet, or individual sheets of your spreadsheet, in your blog or website
Here's what you can do with presentations:
•Share and edit presentations with your friends and coworkers.
•Import and convert existing presentations in .ppt and .pps file types.
•Download your presentations as a PDF, a PPT, or a TXT file.
•Easily edit your presentations.
•Insert images and videos, and format your slides to fit your preferences.
•Allow real-time viewing of presentations, online, from separate remote locations.
•Publish and embed your presentations in a website, allowing access to a wide audience