Alchemist Brewery is still open and producing Heady Topper. They closed the retail and brewery tour side due to traffic problems and a lack of proper state licensing. I believe they are attempting to find another venue for their retail and tastings as they produce (not can) more than just the Topper.
I like Heady Topper/Alchemist, but I prefer both Lawson's Finest and Hill farmstead over it for quality small scale VT beers.
What's the name of the small brewer from mid coast ME, Newcastle/ Damariscotta/ Sheepscot area. I think he brewed in a barn, only sold to a few restaurants, and growlers at local places no further south of Bath. I remember his beers being very smooth and extremely tasty.