Here are a few: Discovery Amber Ale, Honey Beer (formerly Honey Passover Beer), Celia Framboise; there are many more. Don't know how they taste. More can be found with research.
Yes, there are several breweries that make gluten-free beer varieties. As far as flavor, it isn't bad, but definately doesn't have the same flavor as regular beer
There are various gluten-free beers available for purchase. It's usually brewed using Sorghum which definitely gives a slightly different taste and smell than your average beer. As a lover of microbrews and exotic beers I think it tastes great. It's a slightly darker beer with normally a fruity taste. As with most beers the taste depends on the brewer.
Yes, there are several brands that make gluten free beer. These are typically brewed from non-traditional grains. They taste good, depending on the maker.