Promising site, thanks. I think I tried a bit of Jason Mraz but I can't remember much about it! I might give him another go.

I did try sampling some Damien Rice via download. However, my efforts
were totally undermined when I promptly forgot I'd ever tried him, and bought the album based on the reviews on the cover thinking I was being marvelously spontaneous. Maybe it worked on a subconscious level. :-)

I also bought some Matt Nathanson stuff based on downloading a few tracks. His early stuff is great and he's very funny live, but he's increasingly producing tracks that wouldn't sound out of place on Smallville.