ubuntu is very cool
If you like this, you might also like:
brilliant OS, free, fast and easy to use. Very much comparable and in some aspects better than Windows. The only part where it is inferior to Win is the gaming(there are nowhere as near as so many high quality games). However i recommend it for academia, science and business as well as any other interests other than gaming.
Many ways to install it, anyone can do it. Dual booting was so easy to set up I had to laugh at it. Almost no learning curve to start using for a windows user. Updated every 6 months.
Cons: There are a few hardware driver problems occasionally. It may seems dumbed down for some linux users.