Do you any of you people use SMF as a forum software? I do and I like the compatibility. I used to use phpbb but I now realize it is all talk and no walk. You might screw up your forum hardif you try any of the hacks, it has a bunch of security holes and more. It does have better themes though.
That's a must for a tutorial site so users can poted their own tutorials. That is a complete must. If you have enough money, get IPB or Vbulletin, if not, get SMF or phpBB.
it depends on the forum, for vB you have imPex, that is a tool for backup and porting from one type of forum to another type.
i don't know if there are others tools like that