Taken from facebook post from the MT GOX page
Mt.Gox celebrates its first anniversary by offering a 50% discount on fees
TOKYO, JAPAN - March 29th, 2012
Tibanne acquired Mt.Gox in March 2011, and to celebrate this milestone and the Bitcoin community's continued support, we have decided to offer to all of our Mt.Gox customers a 50% discount on all trading fees!
From 00:00:00 GMT on April first, No, this isn't an April Fool's trick, until 23:59:59 GMT on April seventh all trade fees on Mt.Gox will be half price. Note that this is regardless of your trading volume or when you started trading with us!
Meaning that anyone who used to pay 0.6% will pay only 0.3%. This 50% discount on all trade fees will be automatically applied to everyone and relative to volume discounts as cited on our fee schedule.
Make sure you are trading between April first and April seventh to get this celebratory offer!!!
On behalf of Mt.Gox's staff, we would like to once again thank you for your continued support!