I was playing with this suite after reading the review entitled, Adobe Launches Online Office Suite and New Flash-Enabled Acrobat 9 - ReadWriteWeb.
This is rather amazing to experience, give it a try by registering over at Acrobat.com. The feeling they create by deviating from the standard porting of a desktop application to the web is one you must try yourself. I plan to give it a try when writing a paper with someone and the meeting software with a friend in the USA.
Hope it continues to provide this for everyone, drawing users into the Adobe world without charge.