It seems something happened to the database, and the forum went offline.
I noticed it today(oct 8, 2009) at about 7pm(CET) and the system is now back online, with no loss of data.
An added bonus is that the forum is now running v3.0.5, the latest stable version.
(It was on v3.0.1 before)
If anyone notices anything missing, or know when the problem started, feel free to PM me.