Sennheiser HD 280 Pro Monitor Headphones

Comment came in asking about what people think might be a good set of Headphones for Monitoring Audio. I thought it would be interesting to hear the different options out there, so phone lines web lines are open, if you've got a favorite pair, leave your comments about Who, Why, and Where can we find them...

[Update] We got some great feedback in the comments about some great Headphones that are used in the industry.