Former Diabloii.net, now known as Diii.net has a long tradition of making competitions of different shapes and forms. This is a summary of active and finished competitions. The dates are sorted after when the competition started.
August 2008
Caption This Contest
At the end of August, Diii.net launched a competition to make captions for Diablo III screenshots and win the famous WWI 2008 Tyrael WoW-pets. The four screenshots had individual articles for comments as well as winner listing and can be found here:
Term: 20th - 24th August 2008
Prize: Tyrael WoW-pet and WotLK Beta key
Winners: arodriq, Starving_Poet, Timesink
Swords and Tyrael Mini-Pet Contest
A contest in two parts where fans are encouraged to submit fan art related to swords as well as making an "11-Word Short Story Contest" involving making a story exactly 11 words long. The contest page can be found here:
Term: 15th - 31st August 2008
Prize: Swords books by Ben Boos and Tyrael WoW-pet/WotLK Beta keys
Winners: To be Announced