There are not many sites that are actually illegal in their own right. However, the site could get a person into trouble if they are part of it and it has illegal activity on it.
no wiki.answers.com is not illegal.
If it's free, it's almost certainly illegal. The only way around this is if you get it from an official site (i.e. either the band's site or that of their record label). If you want music online, try a known site like iTunes.
No. There is nothing illegal that is happening here for the site to be illegal.
The site itself is not illegal, but the vast majority of materials it links to are.
no
yes
NO!
yes
It is not illegal, but it does break the site policies.
Pirate bay
Yes, if the site is illegal.
No this website is not illegal, The berne act clearly states this fact.