Favorite forums system?

There are many out there so what are yours? I personnally like vBulletin, though it costs so much. But for a free one I like phpbb. What is yours?

I like vBulletin, though they could improve it A LOT more, it's still one of the best forum software out there. IPB would be my backup or secondary pick!

Yes,I also Like vBulletin.
vBulletin have Good support and Many Features.
I think it is Better then IBP.
I don't like IBP.

Invisionfree seems nice for me . The free version is good , wonder about teh payed one .

I like vBulletin, it's the best forums system.

my favourite is V-bulletin

I would agree with the others here that vBulletin is the best forum software around now.
It has many add-on features and is very user-friendly.

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Many successful sites use PHPBB2. It is free and very customizable. I don't think it is every useful to pay for something that you can get for free.

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My favorite forum software is Invision Power Board. It's the software that I got used to forums with, so, that's probably why. As for free software though, probably PHPBB. Relatively customizable, and there are a fair amount of nice themes. Only thing I don't like about PHPBB is that it seems to get hacked a fair amount. But, that's not PHPBB's fault, of course. Generally it's the fault of the webmasters that don't update their software. I myself have procrastinateed updating software and was hacked because of it. So, I can most certainly say that being hacked isn't fun.

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I also love forum based on vBulletin, reason is quite obvious, easy interface, cool look, and built is all features you need, not to mentioned load very quickly, unlike those eye-candy boards, slow and buggy!!