As I explained briefly earlier, the reason the hacker was able to retrieve some people's passwords was that they were encrypted using MD5 (because phpBB, the old forum software, also used it), which is susceptible to
rainbow table attacks.
We're now using a much stronger encryption algorithm (SHA1 + a unique salt, looped multiple times).
I can now 99.9999999% guarantee that even if somebody were to get access to both the encrypted passwords and our unique salt, there is no way they could convert them into the unencrypted original values.
So, go change your password, esp. if you were on the list of people targeted earlier. After you change it you'll have to log in again.
The forum isn't safe yet, but I promise your passwords are.