After Google Doc and MS Office online (trial), now it's time for OOo to have online version of it's application. It's not done by the OOo team itself, but by Ulteo. They have made several application to have online several applications, and now it's OOo time.
In order to try out this service, you will have to sign up for an account (which is free and very quick). After activating your account, then fire up the URL and wait until the applet is loaded. Pick the application you want (Writer, Calc, Impress, Draw, Math, Base) and click Launch OpenOffice.org NOW. You need the latest Java JRE in order to use this feature. Don't try to load this software if you are using slow connection, since it's quite heavy.
It's still based on 2.3.0, but it's not a big deal, since 2.3.1 is only a maintenance version.
Thanks to Florian Effenberger for giving me the information