Extremely cool mashup and their other ones are pretty cool also.
That said, there is something about these guys that rubs me the wrong way. The first time I heard of them was on a show called Private Chefs of Beverly Hills on the Food Network. They were having the chefs cater their CD release party and they had to have everything done by a specific time, for X number of guests, etc. The singer and the tool guitarist come in, bug them in the kitchen and more or less ask to have the chefs prepare meals for them for lunch, which set the chefs way back on getting the dinner catering done. Then the manager is giving the chefs hell all night, because they're running behind, etc.
I can't realy see a big huge career coming from taking two completely different songs and somehow merging them. It's creative as hell, but I can't see making a career out of it.
Either way though, the songs are great. They do an excellent job.