I was just riding at Jay Peak on 3/24, 3/26, and 3/27. They still have plenty of snow and their glades/off trail riding is purely amazing. I went to stowe on 3/25/06 which also has a ton of snow and a great time although it is a much more crowded tourist trap where as Jay Peak seems to be much less known and have much less of a crowd. I can't recall waiting more than 1 min to get on any lift at Jay other than the Tram to the top which holds 60 people and they only have 2 cars on it. I would not get on the Tram line unless your there at open you might as well jump on or towards closing.
I found quite a few secret spots at jay that lots of snow off the trails blow into and dosn't get hit by much sun that and I'll share one with you. Take the quad to the right of the tram when your facing up the mountain to the top and go striaght when you get off and go down the trail "Ullr's Dream" almost immediately when you are on that trail cut right off the trail and into the woods you'll find yourself in waist deep powder after you get down into it cut left through the trees and you'll end up standing on top of burried trees looking down over a horizontal trail below. Take the drop onto the trail and cut down into the woods again for more powder to the bottom. Enjoy.