Open Office released the first release candidate of OOO 3.0.
And opposed to the previous betas, it doesn't immediately crash on my mac (Tiger). Well, this sounds too bad, actually, I did not run it for too long and in this time it did not crash at all.
This does not necessarily mean that it is stable, but the previous versions did crash after that time.
UPDATE: I am just editing a 25 pages document without any issues, so it is really usable now.
I am really looking forward to a final version now.