Valve has made it through the hack-heavy 2011 so far largely unharmed, even as competitors such as Bethesda (opens in new tab), Nintendo, Codemasters, Epic Games (opens in new tab), and of course Sony saw high-profile intrusions call their security into question. Fkn0wned's forum users are downplaying the attack, suggesting the work of a lone nut rather than any organized conspiracy.
#Intrusion 2 hacked full version password
However, when the forum comes back online, it would be sensible to change your password and check what information you're sharing, just in case. Thankfully, there's no evidence that users' Steam accounts have been hacked just yet.
Steam forum users shouldn't be too worried, as forum details are separate from Steam account or password information (unless you've posted those details, of course, which would have been silly).