Do you ever run contests on your community?

Contests usually helps the community grow by bringing in new content and sometimes members. So, do you do this? If so, what type of contests have you ran?

 

I've ran a dozen or so successful contest over the years.
I hope xenforo has a contest mod, I'd like to run one here & on my other forum.
We usually get prizes donated that are targeted to the niche.
Like with this forum we would give away styles & licenses, domains & hosting. Stuff new & old webmasters could use.