Cool! I knew the Hayseed Dixie version (saw them perform here in the Netherlands once, at the Lowlands festival) but the Finnish one is new to me and pretty cool
If you're onto this stuff, you may also like "Fade to Bluegrass" by the band Iron Horse, a bluegrass tribute to Metallica. There's two entire albums worth of Metallica covers, and they're all pretty good (and a good laugh)!
Enter Sandman:
http://www.youtube.com/watch?v=3c7bISLhVl8Unforgiven:
http://www.youtube.com/watch?v=uWI0ZGrC9MgThen again, there's probably a bluegrass version of just about every hit song out there