One way and another (as I wrote over on feeding edge) I have got introduced to the work of Party Ben. Musical mashup maestro.
All his stuff is over on his website and all over other parts of the web.
Check out the Every car you chase mashup of police and snowpatrol. It is so subtle you would not believe.
I was transfixed when I heard this in Second Life, and waddya know there's a video mashup too.
I really love both these main songs, and it is a brilliant combination.