Me too! My birthday is on March 9th. Last year the iPad came out on the 11th. Hopefully pre-orders will before the 9th, or an actual release!
The first full week of March starts on Sunday the 4th. So a March 6th, Tuesday announcement? Hopefully, it'll be the first week March starts, the week before, Thursday, March 1. Though, a Thursday or Friday would be unusual for an announcement. It has happened.
Im thinking announcement that tuesday and iOS 5.1 on that friday, followed by the iPad 3 release the following Friday. I have no evidence to back this up - its only speculation from the latest rumors.